Algebra 2 - Using Quadratic Formula

Algebra
Tutor: None Selected Time limit: 1 Day

1. 12x^2 + 9x + 15 = 0

May 10th, 2015

-b +/-√b^2 - 4ac / 2a

-9 +/-√9^2 - 4(12)(15) / 2(12)

= -9 +/-√-639 / 24

= -9 +/-3i√71 / 24

x = (-3 +/- i√71) / 8

x = - 0.375 + 1.053

x = - 0.375 - 1.053

May 10th, 2015

I meant - 0.375 + 1.053i   and - 0.375 - 1.053i

May 10th, 2015

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May 10th, 2015
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