7=31-4.9x^2

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Solution for 7=31-4.9x^2 equation: 


Simplifying
7 = 31 + -4.9x2

Solving
7 = 31 + -4.9x2

Solving for variable 'x'.

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

Add '4.9x2' to each side of the equation.
7 + 4.9x2 = 31 + -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
7 + 4.9x2 = 31 + 0.0
7 + 4.9x2 = 31

Add '-7' to each side of the equation.
7 + -7 + 4.9x2 = 31 + -7

Combine like terms: 7 + -7 = 0
0 + 4.9x2 = 31 + -7
4.9x2 = 31 + -7

Combine like terms: 31 + -7 = 24
4.9x2 = 24

Divide each side by '4.9'.
x2 = 4.897959184

Simplifying
x2 = 4.897959184

Take the square root of each side:
x = {-2.213133341, 2.213133341}

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