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Simplifying
5x2 + 8 = 21
Reorder the terms:
8 + 5x2 = 21
Solving
8 + 5x2 = 21
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-8' to each side of the equation.
8 + -8 + 5x2 = 21 + -8
Combine like terms: 8 + -8 = 0
0 + 5x2 = 21 + -8
5x2 = 21 + -8
Combine like terms: 21 + -8 = 13
5x2 = 13
Divide each side by '5'.
x2 = 2.6
Simplifying
x2 = 2.6
Take the square root of each side:
x = {-1.61245155, 1.61245155}
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