Hi, I have a question in regard to a quadratic formula I'm solving. 4(a+b)±√(16(a²+2ab+b²)-48ab) / 24 4(a+b)±4√(a²-ab+b²) / 24 I don't understand how +2ab became -ab and why -48ab disappeared. Anyone able to clarify that for me? Thanks David
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Hello Splint Welcome to Math Help Forum! Originally Posted by Splint Hi, I have a question in regard to a quadratic formula I'm solving. 4(a+b)±√(16(a²+2ab+b²)-48ab) / 24 4(a+b)±4√(a²-ab+b²) / 24 I don't understand how +2ab became -ab and why -48ab disappeared. Anyone able to clarify that for me? Thanks David Just remove the inner brackets inside the square root and simplify: Grandad
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