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factorising quadratic equations

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Reply 40
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z_o_e
OP
11
Original post by Ayaz789
Expand the whole bracket! x^2+11x+24 :smile:


Where did you get 11x from?

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Original post by z_o_e
Where did you get 11x from?

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By doing 8*x and 3*x across both brackets
Reply 42
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z_o_e
OP
11
Original post by Ayaz789
Expand the whole bracket! x^2+11x+24 :smile:


Ohhhh I get it nwo

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1464517068933.jpg34.5KB
Original post by z_o_e
Ohhhh I get it nwo

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yes
Reply 44
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z_o_e
OP
11
Original post by Ayaz789
yes


Doneeee :biggrin:

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Original post by z_o_e


Yepp :biggrin:
Reply 46
Avatar for z_o_e
z_o_e
OP
11
Original post by Ayaz789
Yepp :biggrin:


Yayooo thank you :smile:



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Original post by z_o_e
Yayooo thank you :smile:



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Np , not gonna help till 29th of June now yeahh , haha got exams coming up:u:
I've never seen it done this way before!

I just find two numbers that add to make b and multiply to make c, which I guess is just a shortcut version of this really...
If this a calculator paper question you can fully solve quadratics on a good scientific calculator (saved my ass for C2)
Original post by RueXO
If this a calculator paper question you can fully solve quadratics on a good scientific calculator (saved my ass for C2)


Im sure thats gcse stuff?
Original post by Asuna Yuuki
I've never seen it done this way before!

I just find two numbers that add to make b and multiply to make c, which I guess is just a shortcut version of this really...


Yeah same :biggrin: , literally just work the factors in my head haha
Original post by z_o_e
Just needed help on these questions and if someone can check if i did them correctly thank you so much ♡ image is below X


Nice! I don't know this method to factorise quadratic terms. You made it very good. However, one step in your second equation isn't right.

x^2 - x - 12 = 0 <=> x^2 -4x -3x - 12 = 0

You have choosen the wrong sign: -4x -3x = -7x, that is not equal to -x.

It has to be: -4 + 3x = -x
Reply 53
Avatar for z_o_e
z_o_e
OP
11
Original post by Kallisto
Nice! I don't know this method to factorise quadratic terms. You made it very good. However, one step in your second equation isn't right.

x^2 - x - 12 = 0 <=> x^2 -4x -3x - 12 = 0

You have choosen the wrong sign: -4x -3x = -7x, that is not equal to -x.

It has to be: -4 + 3x = -x


Thank you so much ♡

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Reply 54
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z_o_e
OP
11
Original post by Ayaz789
Yeah same :biggrin: , literally just work the factors in my head haha


For Gcses we show the full working out. So if the answer isn't correct at least we get a few marks for the working out!

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Original post by z_o_e
Fore Gcses we show the full working out. So if the answer isn't correct at least we get a few marks for the working out!

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Haha but i know my answer is correct , but for you yeah sure you can show the full working out
Reply 56
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z_o_e
OP
11
Original post by Ayaz789
Haha but i know my answer is correct , but for you yeah sure you can show the full working out


Okay :colondollar:

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Original post by z_o_e
Thank you so much ♡

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No, I have to thank you, really!

I have never seen such steps to solve factorising issues before. You have shown me a good alternative to factorise terms. It facilitates this calculation so much. A great thank you to you.
Reply 58
Avatar for z_o_e
z_o_e
OP
11
Original post by Kallisto
No, I have to thank you, really!

I have never seen such steps to solve factorising issues before. You have shown me a good alternative to factorise terms. It facilitates this calculation so much. A great thank you to you.


Awh this just made my day X

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Original post by Asuna Yuuki
I've never seen it done this way before!

I just find two numbers that add to make b and multiply to make c, which I guess is just a shortcut version of this really...


Original post by Ayaz789
Yeah same :biggrin: , literally just work the factors in my head haha


Exactly, I think the problem OP has is confidence or something, because I've never seen someone do that much working out. And I agree, you can do most things very quickly in your head.

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