Question 607869
(x+y)^2 = (x+y)(x+y)


(x+y)^2 = x^2 + 2xy + y^2


(x+y)^2 = (x^2 + y^2) + 2(xy)


(x+y)^2 = a + 2(a-10)


(x+y)^2 = a + 2a-20


(x+y)^2 = 3a-20

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