For equation y=6x^2-9x+22 choose the correct application of the quadratic formula

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anyway here's the solution solved with the quadratic formula:

a = 6 b=-9 c=22

The solution would be:

x = [--9 + - square root (81 - 4*6*22) ] / 12

x = [9 + - square root (81 - 528) ] / 12

x = [9 + - square root (-447) ] / 12

x =.75 ( + - 1.7619 i)