(x-2)^2=25
x2−4x+4=25
x2−4x+4−25=25−25
x2−4x−21=0
(x+3)(x−7)=0
x+3=0 or x−7=0
x=−3 or x=7
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(x-2)^2=25
x2−4x+4=25
x2−4x+4−25=25−25
x2−4x−21=0
(x+3)(x−7)=0
x+3=0 or x−7=0
x=−3 or x=7