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Original post by z_o_e
You've done the hard work for the first one. So the cube root of 27 is... and squaring that gives ..
Just remember: top is the power and bottom is the root
For the first one: cube root of 27 =?
Then all you do is square that answer (BIDMAS)
I think u can do the others now
For the first one: cube root of 27 =?
Then all you do is square that answer (BIDMAS)
I think u can do the others now
Original post by SeanFM
You've done the hard work for the first one. So the cube root of 27 is... and squaring that gives ..
m8
u beat me to it lel
Spoiler
Original post by CheeseIsVeg
m8
u beat me to it lel
u beat me to it lel
Spoiler
You can help
it's fine.Original post by CheeseIsVeg
Just remember: top is the power and bottom is the root
For the first one: cube root of 27 =?
Then all you do is square that answer (BIDMAS)
I think u can do the others now
For the first one: cube root of 27 =?
Then all you do is square that answer (BIDMAS)
I think u can do the others now
Posted from TSR Mobile
Original post by z_o_e
yea so remember that you root the number by the number on the bottom of the fraction and use the number on the top of the fraction as a power after
you must root first then use power it's a rule
YOU MUST REMEMBER THAT IF YOU GET A NUMBER BIGGER THAN WHAT YOU STARTED WITH WHEN YOU HAVE A FRACTION POWER SMALLER THAN 1 YOU GOT IT WRONG!!!!!!!!!!
Original post by z_o_e
so the bottom one deal with the minus first that just means the 16/81 is flipped
then use what i said above to finish the question
(edited 7 years ago)
Original post by z_o_e
Always do it step by step to avoid mistakes
I think you've not cube rooted it properly
cube root 27 =3 3x3 = 9 n'est pas
Just BIDMAS things and do each step seperately
Spoiler
Original post by fartinugget
yea so remember that you root the number by the number on the bottom of the fraction and use the number on the top of the fraction as a power after
you must root first then use power it's a rule
YOU MUST REMEMBER THAT IF YOU GET A NUMBER BIGGER THAN WHAT YOU STARTED WITH WHEN YOU HAVE A FRACTION POWER SMALLER THAN 1 YOU GOT IT WRONG!!!!!!!!!!
so the bottom one deal with the minus first that just means the 16/81 is flipped
then use what i said above to finish the question
you must root first then use power it's a rule
YOU MUST REMEMBER THAT IF YOU GET A NUMBER BIGGER THAN WHAT YOU STARTED WITH WHEN YOU HAVE A FRACTION POWER SMALLER THAN 1 YOU GOT IT WRONG!!!!!!!!!!
so the bottom one deal with the minus first that just means the 16/81 is flipped
then use what i said above to finish the question
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Original post by SeanFM
You can help it's fine.
it's fine.I did this so far!
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(edited 7 years ago)
Original post by z_o_e
Omg Sean i don't understand this. I need your explanation please!!
I did this so far!
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I did this so far!
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The cube root of 27 is not the same as 3 * root 27
easy mistake to make.On your calculator, can you see the shape (it's above the button x^(square)), which is a yellow square, then a root, then another square? That's what you need to find the cube root or anything root that isn't 2. So you press shift and the x^n button and type in what you want to find.
(Though I think you are not supposed to use a calculator, otherwise you could find it straight away
but it is useful to check)Original post by z_o_e
http://www.thestudentroom.co.uk/attachment.php?attachmentid=552950&d=1466345653
^^ wasn't that the original question?
http://www.thestudentroom.co.uk/attachment.php?attachmentid=552956&d=1466346204
you didn't flip it
16/18 to the power of -3/4 = 18/16 to the power of 3/4
Original post by fartinugget
http://www.thestudentroom.co.uk/attachment.php?attachmentid=552950&d=1466345653
^^ wasn't that the original question?
http://www.thestudentroom.co.uk/attachment.php?attachmentid=552956&d=1466346204
you didn't flip it
16/18 to the power of -3/4 = 18/16 to the power of 3/4
^^ wasn't that the original question?
http://www.thestudentroom.co.uk/attachment.php?attachmentid=552956&d=1466346204
you didn't flip it
16/18 to the power of -3/4 = 18/16 to the power of 3/4
Ohhhhhh so I flip it?
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Original post by z_o_e
http://www.thestudentroom.co.uk/attachment.php?attachmentid=552960&d=1466346345
^^ that's bidmas remember powers come before multiplying so your calculator has squared the root of 27 which is 27 and 27x3 is 81
Original post by fartinugget
http://www.thestudentroom.co.uk/attachment.php?attachmentid=552960&d=1466346345
^^ that's bidmas remember powers come before multiplying so your calculator has squared the root of 27 which is 27 and 27x3 is 81
^^ that's bidmas remember powers come before multiplying so your calculator has squared the root of 27 which is 27 and 27x3 is 81
Is this better?
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Original post by z_o_e
make sure the root sign covers the whole fraction not just the 81 on the top
Original post by z_o_e
Ohhhhhh so I flip it?Posted from TSR Mobile
Original post by fartinugget
make sure the root sign covers the whole fraction not just the 81 on the top
correct
correct
Yayoo thank you so much
Can you introduce me to locais as that's coming up in tomorrow's end of yr exam.
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