Factors of x³ − 7x + 6

Factors of x³ − 7x + 6

The factors of \[ x^3-7x+6 \] are

(a) \(x(x-6)(x-1)\)

(b) \((x^2-6)(x-1)\)

(c) \((x+1)(x+2)(x-3)\)

(d) \((x-1)(x+3)(x-2)\)

Solution

\[ x^3-7x+6 \]

\[ =x^3-x^2+x^2-7x+6 \]

\[ =x^2(x-1)+x(x-1)-6(x-1) \]

\[ =(x-1)(x^2+x-6) \]

\[ =(x-1)(x+3)(x-2) \]

Therefore,

\[ \boxed{(d)\ (x-1)(x+3)(x-2)} \]

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