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Simplifying
25x2 + -40 + -9 = 0
Reorder the terms:
-40 + -9 + 25x2 = 0
Combine like terms: -40 + -9 = -49
-49 + 25x2 = 0
Solving
-49 + 25x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '49' to each side of the equation.
-49 + 49 + 25x2 = 0 + 49
Combine like terms: -49 + 49 = 0
0 + 25x2 = 0 + 49
25x2 = 0 + 49
Combine like terms: 0 + 49 = 49
25x2 = 49
Divide each side by '25'.
x2 = 1.96
Simplifying
x2 = 1.96
Take the square root of each side:
x = {-1.4, 1.4}
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