Question

Factor completely. 5x2 - 45 5(x + 3)(x - 3) 5(x2 - 45) 5(x - 9)(x + 9) (5x + 9)(x - 5)

Answer 1

$5x^2 - 45 = 5(x^2 - 9) = 5(x^2 - 3^2) = 5(x - 3) (x + 3)$


Answer:  5(x - 3) (x + 3)

Answer 2

Answer:

Option A is correct

$5(x+3)(x-3)$

Step-by-step explanation:

Using identity rule:

$(x^2-a^2) = (x-a)(x+a)$

To factor completely:

$5x^2-45$

Take 5 common out we have;

$5(x^2-9)$

Apply the identity rule

then;

$5(x+3)(x-3)$

Therefore, the complete factored of the given equation is: $5(x+3)(x-3)$