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Simplifying
7x2 + 21 = 77
Reorder the terms:
21 + 7x2 = 77
Solving
21 + 7x2 = 77
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-21' to each side of the equation.
21 + -21 + 7x2 = 77 + -21
Combine like terms: 21 + -21 = 0
0 + 7x2 = 77 + -21
7x2 = 77 + -21
Combine like terms: 77 + -21 = 56
7x2 = 56
Divide each side by '7'.
x2 = 8
Simplifying
x2 = 8
Take the square root of each side:
x = {-2.828427125, 2.828427125}
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