solve for x: root 217-x =x-7
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√217-x = x-7
Sq. both sides
217-x = x² + 49 -14x
x² +49 -217 -14x +x = 0
x² -13x -168 = 0
x² -(21-8)x - 168 = 0
x(x-21) + 8(x-21)=0
x=21,-8
Sq. both sides
217-x = x² + 49 -14x
x² +49 -217 -14x +x = 0
x² -13x -168 = 0
x² -(21-8)x - 168 = 0
x(x-21) + 8(x-21)=0
x=21,-8
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