Consider srqrt(x) as the square root of
x.
We
have:
sqrt(x-9) + 1 = sqrt(x) :: taking both side to the
power of 2
[sqrt(x-9) + 1]^2 =
[sqrt(x)]^2
(x-9) + 2*[sqrt(x-9)*1] + 1 = x :: subtracting
x on both sides
2*[sqrt(x-9)] - 8 = 0 :: adding 8 to both
sides and dividing by 2
sqrt(x-9) = 4 :: taking both sides
to the power of 2
x-9 = 16 :: adding 9 to both
sides
x = 25
hope
that helps =)
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