Simplify the expression. $$\left( 13 a ^ { 2 } + 6 a + 9 \right) + \left( 8 a ^ { 2 } + 9 a + 1 \right)$$
A) $21 a ^ { 2 } + 6 a + 10$
B) $21 a ^ { 2 } + 15 a + 10$
C) $21 a ^ { 2 } + 15 a$
D) $13 a ^ { 2 } + 15 a + 10$
E)none of these

Question

Quizplus · Accepted Answer

Combine like terms: $13a^2 + 8a^2 = 21a^2$, $6a + 9a = 15a$, and $9 + 1 = 10$.

Simplify the Expression (13a2+6a+9)+(8a2+9a+1)\left( 13 a ^ { 2 } + 6 a + 9 \right) + \left( 8 a ^ { 2 } + 9 a + 1 \right)(13a2+6a+9)+(8a2+9a+1)

Simplify the Expression $\left( 13 a ^ { 2 } + 6 a + 9 \right) + \left( 8 a ^ { 2 } + 9 a + 1 \right)$