SOLUTION: I am having some problems with theses problems Solve: X^2+5=21 and also solve (x-4)^2=3 and 5(x-2)^2=3 Thanks a million

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Question 93089: I am having some problems with theses problems
Solve: X^2+5=21
and also solve (x-4)^2=3
and 5(x-2)^2=3
Thanks a million
Answer by tutorcecilia(2152) About Me  (Show Source):
You can put this solution on YOUR website!
%28X%5E2%29=21-5
%28sqrt%28x%5E2%29%29= %28sqrt%2816%29%29
x=+-4

.
.
(x-4)(x-4)=3
%28x%5E2-8x%2B16%29=3
%28x%5E2-8x%2B16-3%29=3-3
(x%5E2-8x%2B13%29=0 [use the quadratic formula to solve for the x-value]
.
.
x+=+%28-%28-8%29+%2B-+sqrt%28+%28-8%29%5E2-4%281%29%2813%29+%29%29%2F%282%2A1%29+
.
x+=+%288%29+%2B-+sqrt%28+%2864%29-%2852%29+%2F%282%29%29+
.
x+=+%288%29+%2B-+sqrt%2812%29+%2F2%29+
.
x+=+%288%29+%2B-+2sqrt%283%29+%2F2%29+
.
x=5.732
or x=2.268