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Mathematics 12 Online
OpenStudy (anonymous):

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

OpenStudy (anonymous):

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!

OpenStudy (anonymous):

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

OpenStudy (anonymous):

okay........

OpenStudy (anonymous):

factor out x^2+2x+1

OpenStudy (anonymous):

how?

OpenStudy (anonymous):

(x+___)(x+___)

OpenStudy (anonymous):

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

OpenStudy (anonymous):

1 and 1

OpenStudy (anonymous):

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

OpenStudy (anonymous):

okay

OpenStudy (anonymous):

divide it by 8 to eliminate 8

OpenStudy (anonymous):

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

OpenStudy (anonymous):

okay

OpenStudy (anonymous):

so x=-1

OpenStudy (anonymous):

because x+1=0?

OpenStudy (anonymous):

yep

OpenStudy (anonymous):

ohhhh ok thanks!

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