Solve.
-$$\sqrt { 20 x - 40 } = x + 3$$
A) 9
B) $- 6$
C) 7
D) $- 7$

Name: Solve. -\[\sqrt { 20 x - 40 } = x + 3\] A) 9 B) $- 6$ C) 7 D) $- 7$
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Question

Quizplus · Accepted Answer

To solve the equation, square both sides to get $20x - 40 = (x + 3)^2$. Expanding the right side gives $x^2 + 6x + 9$. Rearrange to form a quadratic equation: $x^2 - 14x + 49 = 0$. Solving this gives $x = 7$ as the only real solution.

Solve - 20x−40=x+3\sqrt { 20 x - 40 } = x + 320x−40​=x+3

Solve
- $\sqrt { 20 x - 40 } = x + 3$