Question

Maria expanded the following square as follows: (x+3)² =x²+9, is this correct?

Answer 1

Answer:

x² + 6x + 9

Explanation:

$\sf = \left(x+3\right)^2$

Use perfect square formula: (a + b)² = a² + 2ab + b²

$= \sf x^2 + 2(x) (3) + 3^2$

simplify the following

$= \sf x^2 + 6x +9$

Hence Maria is not correct. The correct answer is x² + 6x + 9.