How do you solve the equation 3x^2-5x-8=2x-3 by completing the square?

1 Answer
Jul 24, 2017

x =1/6(7+-sqrt109)

Explanation:

3x^2 - 5x -8 =2x-3 or 3x^2 - 5x -8 -2x+3 =0 or

3x^2 - 7x -5 =0 or 3 (x^2-7/3x) -5 or

3(x^2-7/3x+(7/6)^2) - 3*49/36 -5 =0

3 (x-7/6)^2 - 49/12-5 or 3 (x-7/6)^2 = 109/12 or

(x-7/6)^2 = 109/(3*12) or (x-7/6) = +- sqrt (109/36) or

x = 7/6+- sqrt (109)/6 =1/6(7+-sqrt109) [Ans]