10=-9.6x^2+30x+20

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Solution for 10=-9.6x^2+30x+20 equation:


Simplifying
10 = -9.6x2 + 30x + 20

Reorder the terms:
10 = 20 + 30x + -9.6x2

Solving
10 = 20 + 30x + -9.6x2

Solving for variable 'x'.

Combine like terms: 10 + -20 = -10
-10 + -30x + 9.6x2 = 20 + 30x + -9.6x2 + -20 + -30x + 9.6x2

Reorder the terms:
-10 + -30x + 9.6x2 = 20 + -20 + 30x + -30x + -9.6x2 + 9.6x2

Combine like terms: 20 + -20 = 0
-10 + -30x + 9.6x2 = 0 + 30x + -30x + -9.6x2 + 9.6x2
-10 + -30x + 9.6x2 = 30x + -30x + -9.6x2 + 9.6x2

Combine like terms: 30x + -30x = 0
-10 + -30x + 9.6x2 = 0 + -9.6x2 + 9.6x2
-10 + -30x + 9.6x2 = -9.6x2 + 9.6x2

Combine like terms: -9.6x2 + 9.6x2 = 0.0
-10 + -30x + 9.6x2 = 0.0

Begin completing the square.  Divide all terms by
9.6 the coefficient of the squared term: 

Divide each side by '9.6'.
-1.041666667 + -3.125x + x2 = 0

Move the constant term to the right:

Add '1.041666667' to each side of the equation.
-1.041666667 + -3.125x + 1.041666667 + x2 = 0 + 1.041666667

Reorder the terms:
-1.041666667 + 1.041666667 + -3.125x + x2 = 0 + 1.041666667

Combine like terms: -1.041666667 + 1.041666667 = 0.000000000
0.000000000 + -3.125x + x2 = 0 + 1.041666667
-3.125x + x2 = 0 + 1.041666667

Combine like terms: 0 + 1.041666667 = 1.041666667
-3.125x + x2 = 1.041666667

The x term is -3.125x.  Take half its coefficient (-1.5625).
Square it (2.44140625) and add it to both sides.

Add '2.44140625' to each side of the equation.
-3.125x + 2.44140625 + x2 = 1.041666667 + 2.44140625

Reorder the terms:
2.44140625 + -3.125x + x2 = 1.041666667 + 2.44140625

Combine like terms: 1.041666667 + 2.44140625 = 3.483072917
2.44140625 + -3.125x + x2 = 3.483072917

Factor a perfect square on the left side:
(x + -1.5625)(x + -1.5625) = 3.483072917

Calculate the square root of the right side: 1.866299257

Break this problem into two subproblems by setting 
(x + -1.5625) equal to 1.866299257 and -1.866299257.

Subproblem 1

x + -1.5625 = 1.866299257 Simplifying x + -1.5625 = 1.866299257 Reorder the terms: -1.5625 + x = 1.866299257 Solving -1.5625 + x = 1.866299257 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5625' to each side of the equation. -1.5625 + 1.5625 + x = 1.866299257 + 1.5625 Combine like terms: -1.5625 + 1.5625 = 0.0000 0.0000 + x = 1.866299257 + 1.5625 x = 1.866299257 + 1.5625 Combine like terms: 1.866299257 + 1.5625 = 3.428799257 x = 3.428799257 Simplifying x = 3.428799257

Subproblem 2

x + -1.5625 = -1.866299257 Simplifying x + -1.5625 = -1.866299257 Reorder the terms: -1.5625 + x = -1.866299257 Solving -1.5625 + x = -1.866299257 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5625' to each side of the equation. -1.5625 + 1.5625 + x = -1.866299257 + 1.5625 Combine like terms: -1.5625 + 1.5625 = 0.0000 0.0000 + x = -1.866299257 + 1.5625 x = -1.866299257 + 1.5625 Combine like terms: -1.866299257 + 1.5625 = -0.303799257 x = -0.303799257 Simplifying x = -0.303799257

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.428799257, -0.303799257}

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