Question

if a= x+y and b=x-y show that (a+b) square = 4x square

Answer 1

Answer:

add both the equation

a+b =x+y+x-y

a+b = 2x

square on both sides

$(a + b) {}^{2} = (2x) {}^{2} \\ (a + b) {}^{2} = {4x}^{2}$

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