Question: Solve for x. Solving square root equations often results in extraneous solutions, or answers that don't work in the original equation, so be sure to

Solve for x. Solving square root equations often results in extraneous solutions, or answers that don't work in the original equation, so be sure to check your work.
a. 3 + √x - 4 = 20
b. √x + 7 = - 3
c. 4 - (x - 2)2 = - 21
d. 5 - √-(x + 4) = 2

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