Question

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

Answer 1

Answer:

9x² + 42x + 49

Step-by-step 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

Answer:

$9x^2 + 42x + 49$

Step-by-step 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: $9x^2 + 42x + 49$