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In proving the quadratic formula, what is the appropriate justification forthe last step?ax+bx+c 0Need to...

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In proving the quadratic formula, what is the appropriate justification forthe last step?ax+bx+c 0Need to rewrite for common denominator of 2aEquivalent expressionsc)Use completing the square to isolate squared termd) Keeping both sides equivalente)The last step is incorrect

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