(x2 plus 40) (x minus 1)
-x2 + x + 42 = -[x2 - x - 42] = -[x2 - 7x + 6x - 42] = -[x*(x - 7) + 6*(x - 7)] = -(x - 7)*(x + 6)
44
This is not factorable. You would have to do the quadratic formula for this problem.
(x - 12)(x - 7)
(x2 plus 40) (x minus 1)
(x-4)
-x2 + x + 42 = -[x2 - x - 42] = -[x2 - 7x + 6x - 42] = -[x*(x - 7) + 6*(x - 7)] = -(x - 7)*(x + 6)
It is: (x+7)(x-6) when factored
44
(x2 + 3x + 5)(x2 - 3x + 4)
This is not factorable. You would have to do the quadratic formula for this problem.
(x - 12)(x - 7)
Factor out the GCF and get X(X2-X+1).
Easy, peasy! x2 + 7x - 144 = (x + 16)(x - 9).
x2 - 9x + 18 = (x - 3)(x - 6)
3x2 - 15x + 42 = 3*(x2 - 5x + 14) which cannot be factorised further.