To factor the expression 3x2 – 9x, caleb found the gcf as shown.   list the factors: 3x2 = 3 • x • x 9x = 3 • 3 • x gcf = 3 • 3 • x • x = 9x2 what is calebs error?

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality