SOLUTION: write in vertex form -2x^2-12x-y-21= 0

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Question 597275: write in vertex form -2x^2-12x-y-21= 0
Answer by solver91311(24713) About Me  (Show Source):
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Step 1: Move the and terms to the RHS:



Step 2: In the RHS only, factor out the lead coefficient:



Step 3: Divide the coefficient on the first degree term by 2, square the result, and add that result inside the parentheses. Multiply that value by the lead coefficient and add to the LHS to compensate:



Step 4: Collect terms in the LHS and factor the perfect square trinomial in the RHS:



Step 5: Add 3 to both sides, then multiply by -1:



John

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