Double Radical Equations

Algebra
Tutor: None Selected Time limit: 1 Day

Jan 29th, 2015

sqrt(x+12) - sqrt(x-9) = 3

sqrt(x+12) = 3 + sqrt(x-9)
taking square on both side,

x+12 = 9 + x -9 +2.3.sqrt(x-9)
x+12 = x+6sqrt(x-9)
12=6sqrt(x-9)
2= sqrt(x-9)


squaring both side,

4= x-9

x= 13

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Jan 29th, 2015

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