Which expression is equivalent to 2x^2 + 7x + 4?

A.(2x-1)(x+4)
B.(2x+1)(x-4)
C.(2x+1)(x+4)
D. None of these

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