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Simplifying
40x2 + -28 + -7 = 0
Reorder the terms:
-28 + -7 + 40x2 = 0
Combine like terms: -28 + -7 = -35
-35 + 40x2 = 0
Solving
-35 + 40x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '35' to each side of the equation.
-35 + 35 + 40x2 = 0 + 35
Combine like terms: -35 + 35 = 0
0 + 40x2 = 0 + 35
40x2 = 0 + 35
Combine like terms: 0 + 35 = 35
40x2 = 35
Divide each side by '40'.
x2 = 0.875
Simplifying
x2 = 0.875
Take the square root of each side:
x = {-0.935414347, 0.935414347}
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