Solve x2 + 9x + 9 = 0. (2 points) a
quantity of negative 9 plus or minus 3 square root of 5 all over 2

b
quantity of 9 plus or minus 3 square root of 5 all over 2

c
quantity of negative 9 plus or minus square root of 117 all over 2

d
quantity of 9 plus or minus square root of 117 all over 2

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