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Solving Quadratics

Solve: $x^{2}+10x+25=64$

$(x+5)(x+5)=64$

$\sqrt{(x+5)^{2}}=\sqrt{64}$

$x+5=\pm 8$

$x+5=8\rightarrow x+5-5=8-5\rightarrow x=3$

$x+5=-8\rightarrow x+5-5=-8-5\rightarrow x=-13$