Question

Factor completely. x2 - 400 (x + 20) (x - 20) 0 (x + 4)(x + 100) 0 (x + 25)(x - 16) (x - 50) (x +8) plz​

Answer 1

Explanation:

• x²-400
• (x)²-(20)²

By the formula, [a²-b²=(a+b)(a-b)]

• (x+20)(x-20)

Hence, first option is correct

Answer 2

`\\ \sf\ast\Rrightarrow x^2-400`

`\\ \sf\ast\Rrightarrow (x)^2-(20)^2`

• a^2-b^2=(a+b)(a-b)

`\\ \sf\ast\Rrightarrow (x+20)(x-20)`