# SOLUTION: I have a question Simplify by factoring. {{{sqrt(48a^2b)}}} Simplify {{{3 sqrt(-1/125)}}} Solve {{{sqrt(5x+21)=x+3}}}

Algebra ->  Algebra  -> Polynomials-and-rational-expressions -> SOLUTION: I have a question Simplify by factoring. {{{sqrt(48a^2b)}}} Simplify {{{3 sqrt(-1/125)}}} Solve {{{sqrt(5x+21)=x+3}}}      Log On

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 Question 438741: I have a question Simplify by factoring. Simplify Solve Answer by unlockmath(1599)   (Show Source): You can put this solution on YOUR website!Hello, I'll help you with the last one. sqrt(5x+21)=x+3 First off we can square both sides to 5x+21=(x+3)^2 Expand this out: 5x+21=x^2+6x+9 Subtract 5x and 21 to get: x^2+x-12=0 Factor (x-3)(x+4)=0 Solve for x x=3 x=-4 So we find that 3 works in the equation. Make sense? RJ www.math-unlock.com