Question 474974
Andrew factored the expression 28x^3-42x^2+35x as 7x(4x^2+6x-5). But when Melissa applied the distributive law and multiplied out 7x(4x^2+6x-5), she got 28x^3+42x^2-35x ; thus, Andrew’s solution does not appear to check. Why is that? 
:
28x^3 - 42x^2 + 35x as 7x(4x^2 + 6x - 5), 
the signs are wrong, should be:
28x^3 - 42x^2 + 35x  = 7x(4x^2 - 6x + 5)