Sunshine447
Solve the quadratic equation.
8x^2 + 16x + 8 = 0



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Sunshine447
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I know how to do this the "plug and play" method, but can someone teach me how to do it when it;s NOT multiple choice? Thanks!

CJVelasco
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take out 8 and it gives you 8(x^2+2x+1)

Sunshine447
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okay........

CJVelasco
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factor out x^2+2x+1

Sunshine447
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how?

CJVelasco
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(x+___)(x+___)

CJVelasco
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think of two numbers that gives you 2 ehrn you add and gives you 1 when you multiply

Sunshine447
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1 and 1

CJVelasco
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good
then, thats 8(x+1)(x+1)

Sunshine447
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okay

CJVelasco
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divide it by 8 to eliminate 8

CJVelasco
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then it will be (x+1)(x+1)=0

Sunshine447
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okay

CJVelasco
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so x=1

Sunshine447
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because x+1=0?

CJVelasco
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yep

Sunshine447
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ohhhh ok thanks!