9=28-4.9x^2

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Solution for 9=28-4.9x^2 equation: 


Simplifying
9 = 28 + -4.9x2

Solving
9 = 28 + -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.
9 + 4.9x2 = 28 + -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
9 + 4.9x2 = 28 + 0.0
9 + 4.9x2 = 28

Add '-9' to each side of the equation.
9 + -9 + 4.9x2 = 28 + -9

Combine like terms: 9 + -9 = 0
0 + 4.9x2 = 28 + -9
4.9x2 = 28 + -9

Combine like terms: 28 + -9 = 19
4.9x2 = 19

Divide each side by '4.9'.
x2 = 3.87755102

Simplifying
x2 = 3.87755102

Take the square root of each side:
x = {-1.969149822, 1.969149822}

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