Question:
fourmulas and sums
Answer:
Here are the formulas:
(a + b)2 = a2 + b2 + 2ab
(a - b)2 = a2 + b2 - 2ab
(a + b)*(a - b) = a2 - b2
(x + a)*(x + b) = x2 + (a + b)x + ab
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