tasneem.016
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i have a test tomorrow and i still dont understand. i want to cey. i dont understand (16y^8)3/4. and is there any way for me to understand maths . thanks to anyone who replies
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mollybaldwin111
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(Original post by tasneem.016)
i have a test tomorrow and i still dont understand. i want to cey. i dont understand (16y^8)3/4. and is there any way for me to understand maths . thanks to anyone who replies
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mqb2766
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(Original post by tasneem.016)
i have a test tomorrow and i still dont understand. i want to cey. i dont understand (16y^8)3/4. and is there any way for me to understand maths . thanks to anyone who replies
Its all about doing practice and understanding the rules. If you're feeling left behind, make sure you put some catch up effort in after the test.

For (16y^8)^3/4, I presume that its raised to the power 3/4? Do you know what that means - take the fourth root and cube (power 3) the result. Do this both to the number (16) and the variable (y^8).
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tasneem.016
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(Original post by mollybaldwin111)
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i checked the mark scheme and the answer is 8y^5
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tasneem.016
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(Original post by mqb2766)
Its all about doing practice and understanding the rules. If you're feeling left behind, make sure you put some catch up effort in after the test.

For (16y^8)^3/4, I presume that its raised to the power 3/4? Do you know what that means - take the fourth root and cube (power 3) the result. Do this both to the number (16) and the variable (y^8).
lool thank you so much but i still dont get it
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mqb2766
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(Original post by tasneem.016)
lool thank you so much but i still dont get it
the answer should be 8y^6.
What is the fourth root of 16 (take the square root twice)?
Then cube that answer.
So 16^(3/4) = ....
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tasneem.016
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(Original post by mqb2766)
the answer should be 8y^6.
What is the fourth root of 16 (take the square root twice)?
Then cube that answer.
So 16^(3/4) = ....
so the fourth root of 16 is 2 when you cube 2 you get 8 then how do you get y^6. i know im being annoyed but im rlly upset cos im in set 1 and i dnt understand this
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mqb2766
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(Original post by tasneem.016)
so the fourth root of 16 is 2 when you cube 2 you get 8 then how do you get y^6. i know im being annoyed but im rlly upset cos im in set 1 and i dnt understand this
Do the same to the y^8 term. This is y*y*...*y, 8 times.
What is the fourth root, i.e. what multiplied by itself 4 times gives y^8? Again it may be easier to square root twice.
Then cube that answer, i.e. multiply by itself three times.
So (y^8)^3/4 = ...
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tasneem.016
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(Original post by mqb2766)
Do the same to the y^8 term. This is y*y*...*y, 8 times.
What is the fourth root, i.e. what multiplied by itself 4 times gives y^8? Again it may be easier to square root twice.
Then cube that answer, i.e. multiply by itself three times.
So (y^8)^3/4 = ...
ohhhhhhhhhhh i get it. THANK YOU SO MUCHHHHHHH
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username4952620
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literally. maths is such a hard subject
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Physics Enemy
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(Original post by tasneem.016)
i dont understand (16y^8)^(3/4)
16^(3/4) = (2^4)^(3/4) = 2^(4*3/4) = 2^3 = 8
(y^8)^(3/4) = y^(8*3/4) = y^6
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The Joker ~
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Nobody gets done with maths in this life!
But it is only maths' privilege to get done with you ~
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