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Square of a Trinomial | (a + b + c)^2 Formula

Now we will learn to expand the square of a trinomial (a + b + c). Let (b + c) = x. Then (a + b + c) 2 = (a + x) 2 = a 2 + 2ax + x 2 = a 2 + 2a (b + c) + (b + c) ...

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