(a+b) whole square -2a(a+b) -125
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Step-by-step explanation:
(a-b)² = (a+b)² -4ab
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Step-by-step explanation:
(a+b)^2-2a(a+b)-125
=>a^2+b^2+2ab-2a^2-2ab-125
=>b^2+2ab-a^2-2ab-125
=>b^2-a^2=125
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