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convert 3x^2 7x-5=y to vertex form and solve for the x intercepts

label Algebra
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converting from standard form to vertex form and solving for x

Mar 17th, 2015

y = 3x^2+7x - 5

y = 3(x^2+7/3x) - 5

y = 3(x+7/6)^2 - 5 - 49/12

y = 3(x+7/6)^2 - 109/12   vertex form

solve for x:

3(x+7/6)^2 - 109/12 = 0

3(x+7/6)^2 = 109/12

(x+7/6)^2 = 109/36

x+7/6 = +/- sqrt(109/36) = +/- sqrt(109)/6

x = (-7+sqrt(109)) / 6

x = (-7 - sqrt(109)) / 6

Mar 17th, 2015

where do you get - 109/12? 

Mar 17th, 2015

109/36 time 3

Mar 17th, 2015

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