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Answer to Question #12427 in Algebra for christen

Question #12427
How do you factor 6x^2+15x-36?
Expert's answer
To factor 6x^2+15x-36 we need to find roots of the equation 6x^2+15x-36=0.
x1,2=(-15+-sqrt(225+36*24))/12=(-15+-33)/12. Therefore x1=(-15+33)/12=18/12=3/2, x2=(-15-33)/12=-4
So due to factor theorem we obtain
6x^2+15x-36=6(x-(-4))(x-3/2)=6(x+4)(x-3/2)=3(x+4)(2x-3)

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