2 Answers

Berhir · Answer 1 · 2021-07-08T03:18:14+0000

Answer:

-7

Explanation:

$\sqrt{ {x}^(2) - 3x - 6} = x - 1$

Squaring on both sides:

${x}^(2) - 3x - 6 = {(x - 1)}^(2)$

Use the formula:
${(a - b)}^(2) = {a}^(2) - 2ab + {b}^(2)$

${x}^(2) - 3x - 6 = {x}^(2) - 2x + 1$

Combine like terms.

${x}^(2) - {x}^(2) - 3x + 2x = 1 + 6$

Calculate

Hope this helps...

Good luck on your assignment..