Question

Find answer for : (x-6) (x-7)(x+1)

Answer 1

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$[ (x-6) (x-7)](x+1) \\ \\ [ x(x-7) - 6(x-7)](x + 1) \\ \\ [{x}^{2} - 7x - 6x + 42](x +1 ) \\ \\({x}^{2} - 13x + 42)(x + 1) \\ \\ x({x}^{2} - 13x + 42) + 1({x}^{2} - 13x + 42) \\ \\ x {}^{3} - 13 {x}^{2} + 42x + {x}^{2} - 13x + 42 \\ \\ {x}^{3} - 13 {x}^{2} + {x}^{2} + 42x - 13x + 42 \\ \\ x {}^{3} - 12 {x}^{2} + 29x + 42$