How to solve X^2+10x=24 by completing the square.

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How to solve X^2+10x=24 by completing the square.

Mathematics
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what times what equals 24 and those same numbers have to add upto 10
12 and -2 right?
or 4 and 6

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\[x^2+10x=(x+5)^2-25\] Do you understand this?
no 4 and 6 when u multiply its 24 not -24
srry it has to multiply to -24
... or we could actually help him with the mechanics of the question
*or her
so the answer is (x-2)(x+10)
if you multiply using foils u can see it equals the question
Really, that's not completing the square.
http://en.wikipedia.org/wiki/Completing_the_square Needs to be in the form (x+k)^2=c
okie
ur right srry
Okay, @lizzy87 , do you understand why\[x^2+10x=(x+5)^2-25\]?
how didi you get the 5?
|dw:1346521462011:dw| Because 2x5=10
|dw:1346521508364:dw|
And if you take away 25 and cancel the 2 5x's into one 10x, that happens.
|dw:1346521563679:dw|
oh ok see how you got that thanks
\[x^2+10x=24\] \[x^2+10x=(x+5)^2-25\] Therefore\[24=(x+5)^2-25\] and\[49=(x+5)^2\]
1- Did you understand that 2- What do you think we could do now to simplify?
\[\pm \sqrt{49}=x+5\]

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