Question

Simplify 3a(a²+7) +2(a+3) and find its value for a=2​

Answer 1

EXPLANATION.

Simplify.

⇒ 3a(a² + 7) + 2(a + 3).

As we know that,

Expand this equation, we get.

⇒ 3a³ + 21a + 2a + 6.

⇒ 3a³ + 23a + 6.

Put the value of a = 2 in the equation, we get.

⇒ 3(2)³ + 23(2) + 6.

⇒ 3(8) + 46 + 6.

⇒ 24 + 46 + 6.

⇒ 76.

Answer 2

Answer :-

We have:-

⟹ 3a(a²+7) + 2(a+3)

For a = 2,

⟹ 3(2)(2² + 7) + 2(2 + 3)

⟹ 3(2)(4 + 7) + 2(5)

⟹ 6(11) + 10

⟹ 66 + 10

⟹ 76

∴ 76 is the value of the expression 3a(a²+7) + 2(a+3), when a = 10.