2 years ago

Which of the following is a factor of x^3-4x^2-18x+9

2 answers:

7 0

Hello,

$x^3-4x^2-18x+9\\
=x^3+3x^2-7x^2-21x+3x+9\\
=x^2(x+3)-7x(x+3)+3(x+3)\\
=(x+3)(x^2-7x+3)\\
=(x+3)(x- \frac{7- \sqrt{37}}{2} )(x- \frac{7+ \sqrt{37}}{2} )$

monitta2 years ago

3 0

(x-2)(x^2-7x+3) most likely

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