Solve the equation by factoring #18

label Algebra
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Solve the equation by factoring.


 2x2 - 15x = 8


Mar 3rd, 2015

2x^2-15x-8=0

set 2x^2-15x-8=(2x+a)(x+b)=0

you can have 2x^2+2bx+ax+ab=0

set 2b+a=-15 and ab=8 

solve these two equations, you can get a=1 and b=-8

so 2x^2-15x-8=(2x+1)(x-8)=0

Mar 3rd, 2015

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Mar 3rd, 2015
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Mar 3rd, 2015
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