4x^2-12x/7x-21

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Solution for 4x^2-12x/7x-21 equation: 


x in (-oo:+oo)

4*x^2-(((12*x)/7)*x)-21 = 0

4*x^2+(-12/7)*x^2-21 = 0

16/7*x^2 = 21 // : 16/7

x^2 = 147/16

x^2 = 147/16 // ^ 1/2

abs(x) = (147/16)^(1/2)

x = (147/16)^(1/2) or x = -(147/16)^(1/2)

x in { (147/16)^(1/2), -(147/16)^(1/2) }

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