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Simplifying
7x2 + -18 + 11 = 0
Reorder the terms:
-18 + 11 + 7x2 = 0
Combine like terms: -18 + 11 = -7
-7 + 7x2 = 0
Solving
-7 + 7x2 = 0
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 + 7x2 = 0 + 7
Combine like terms: -7 + 7 = 0
0 + 7x2 = 0 + 7
7x2 = 0 + 7
Combine like terms: 0 + 7 = 7
7x2 = 7
Divide each side by '7'.
x2 = 1
Simplifying
x2 = 1
Take the square root of each side:
x = {-1, 1}
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