Kaitlyn was asked to find which expression below is equivalent to -3x + 5(x + 2)?
She chose A.
What is the correct answer? What do you think her error was?

A. 2x + 2
B. -x + 2
C. 2x +10
D. -8x + 10

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.