-0.4x^2+10=6.4

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Solution for -0.4x^2+10=6.4 equation: 


Simplifying
-0.4x2 + 10 = 6.4

Reorder the terms:
10 + -0.4x2 = 6.4

Solving
10 + -0.4x2 = 6.4

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-10' to each side of the equation.
10 + -10 + -0.4x2 = 6.4 + -10

Combine like terms: 10 + -10 = 0
0 + -0.4x2 = 6.4 + -10
-0.4x2 = 6.4 + -10

Combine like terms: 6.4 + -10 = -3.6
-0.4x2 = -3.6

Divide each side by '-0.4'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}

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