Coordinates of the vertex for the parabola y=x^2+6x-7

Find the value of x. give reasons to justify your solutions! l, m ∈ kn

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given

3c2 + 2d)(–5c2 + d) select all of the partial products for the multiplication problem above.