Answer to Question #259694 in Calculus for bbz

Question #259694

why did (7-a)^2 + (2-b)^2 = R^2 become (2-b)^2 - b^2= 0

Expert's answer

"(2-b)^2 + (7-a)^2-R^2=0"

if

"b^2=R^2- (7-a)^2"

then we get

"(2-b)^2 = b^2"

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