(x2-9)/10=4

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Solution for (x2-9)/10=4 equation: 


x in (-oo:+oo)

(x^2-9)/10 = 4 // - 4

(x^2-9)/10-4 = 0

(x^2-9)/10+(-4*10)/10 = 0

x^2-4*10-9 = 0

x^2-49 = 0

(x^2-49)/10 = 0

(x^2-49)/10 = 0 // * 10

x^2-49 = 0

1*x^2 = 49 // : 1

x^2 = 49

x^2 = 49 // ^ 1/2

abs(x) = 7

x = 7 or x = -7

x in { 7, -7 }

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