Question

Need the answer
Find (3x+7)2 .

Answer 1

9x² + 42x + 49

Explanation:

Identity

• (x + a)² = x² + 2ax + a²

In this case, x = 3x and a = 7, so substitute the values.

• (3x + 7)²
• (3x)² + 2(3x)(7) + (7)²
• 9x² + 42x + 49

Answer 2

`9x^2 + 42x + 49`

Explanation:

Step 1: Factor out the expression

`(3x + 7)^2`

`(3x + 7)(3x + 7)`

`(3x * 3x) + (3x * 7) + (7 * 3x) + (7 * 7)`

`9x^2 + 21x + 21x + 49`

`9x^2 + 42x + 49`

Answer:
`9x^2 + 42x + 49`