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Mathematics
Kamren Stanley
14 July, 00:59
Write - 3x^2-18-31 in vertex form.
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Darrell Ruiz
14 July, 04:38
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Get into form a (x-h) ²+k
complete the square
-3x²-18x-31
group x terms
(-3x²-18x) - 31
undistribute the - 3
-3 (x²+6x) - 31
take 1/2 of the linear coefient (6) and squaer it
6/2=3, 3²=9
add positive and negative of it inside parenthasees
-3 (x²+6x+9-9) - 31
complete the square
-3 ((x+3) ²-9) - 31
expand
-3 (x+3) ²+27-31
-3 (x+3) ²-4 is vertex form
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