-x2 + x + 42= -x2 + 7x - 6x + 42= 7x - x2 + 42 - 6x= x(7 - x) + 6(7 - x)= (7 - x)(x + 6)
x2 + 7x = 2x2 + 6 x2 - 2x2 + 7x = 6 -x2 +7x - 6 = 0 or alternatively x2 - 7x + 6 = 0
x3 - 7x2 + 6x =x (x2 - 7x + 6) =x (x - 6) (x - 1)
i got 42 divided 7x
x3 - 7x2 + 6x = x(x2 - 7x + 6) = x(x2 - x - 6x + 6) = x[x(x - 1) - 6(x - 1)] = x2(x - 1) - 6x(x - 1) = (x2 - 6x)(x - 1)
-x2 + x + 42= -x2 + 7x - 6x + 42= 7x - x2 + 42 - 6x= x(7 - x) + 6(7 - x)= (7 - x)(x + 6)
x2 + 7x = 2x2 + 6 x2 - 2x2 + 7x = 6 -x2 +7x - 6 = 0 or alternatively x2 - 7x + 6 = 0
Do you mean x2+7x+12? If so then it is: (x+3)(x+4)
x2 + 7x + 6 = (x + 6) (x + 1)
x2 + 7x + 9 = 3 ∴ x2 + 7x + 6 = 0 ∴ (x + 6)(x + 1) = 0 ∴ x ∈ {-6, -1}
x3 - 7x2 + 6x =x (x2 - 7x + 6) =x (x - 6) (x - 1)
i got 42 divided 7x
x3 - 7x2 + 6x = x(x2 - 7x + 6) = x(x2 - x - 6x + 6) = x[x(x - 1) - 6(x - 1)] = x2(x - 1) - 6x(x - 1) = (x2 - 6x)(x - 1)
(x + 5)(x + 2)
x2- 7x + 6 = 0 factor, (x-6)(x-1) = 0 x = 6 x = 1
x^2 +7x+6 = (x+1)(x+6) when factored
x2 × 7x = 7x3