Question

Explain, in complete sentences, how to factor 3x2 – 3x – 60. Explain how your factors could be checked for accuracy.

Answer 1

=>3(x^2- x -20)
=>3(x^2 -5x +4x -20)
=>3(x-5)(x+4)

if you put x=5 or x=-4 your original equation should give zero .
that is a way to check for accuracy

Answer 2

Use the quadratic formula
3x^2-3x-60............

x=(-(-3)+(sqrt(3^2-(4*2*-60))/(2*3)