algebra

I need help with these problem please.
X^2+6=15

(x+4)^2=6

can some one help me please.

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  1. x^2 + 6 = 15
    x^2 = 9
    x = +3 or x=-3

    x+4 = sqrt 6 or -sqrt 6

    x = -4 + sqrt 6
    or
    x = -4 - sqrt 6

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