x[x]-7=8

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Solution for x[x]-7=8 equation: 


Simplifying
x[x] + -7 = 8

Multiply x * x
x2 + -7 = 8

Reorder the terms:
-7 + x2 = 8

Solving
-7 + x2 = 8

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '7' to each side of the equation.
-7 + 7 + x2 = 8 + 7

Combine like terms: -7 + 7 = 0
0 + x2 = 8 + 7
x2 = 8 + 7

Combine like terms: 8 + 7 = 15
x2 = 15

Simplifying
x2 = 15

Take the square root of each side:
x = {-3.872983346, 3.872983346}

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