Question

Finn checks that (x−1)(x+3)=x2+2x−3 by multiplying and gets x2−x+3x−3. He believes he must have made a multiplication error. Is he correct? Explain.

Answer 1

No multiplication error.He is still correct. He should solve for the like terms (-x+3x)= 2x

Explanation:

Given the expression as;

(x-1)(x+3)

Distribute as;

x(x+3)-1(x+3)

open brackets

x*x+x*3-1*x-1*3

x²+3x-x-3

x²+2x-3