3=10x-4.9x^2

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Solution for 3=10x-4.9x^2 equation:


Simplifying
3 = 10x + -4.9x2

Solving
3 = 10x + -4.9x2

Solving for variable 'x'.

Reorder the terms:
3 + -10x + 4.9x2 = 10x + -10x + -4.9x2 + 4.9x2

Combine like terms: 10x + -10x = 0
3 + -10x + 4.9x2 = 0 + -4.9x2 + 4.9x2
3 + -10x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
3 + -10x + 4.9x2 = 0.0

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

Divide each side by '4.9'.
0.612244898 + -2.040816327x + x2 = 0

Move the constant term to the right:

Add '-0.612244898' to each side of the equation.
0.612244898 + -2.040816327x + -0.612244898 + x2 = 0 + -0.612244898

Reorder the terms:
0.612244898 + -0.612244898 + -2.040816327x + x2 = 0 + -0.612244898

Combine like terms: 0.612244898 + -0.612244898 = 0.000000000
0.000000000 + -2.040816327x + x2 = 0 + -0.612244898
-2.040816327x + x2 = 0 + -0.612244898

Combine like terms: 0 + -0.612244898 = -0.612244898
-2.040816327x + x2 = -0.612244898

The x term is -2.040816327x.  Take half its coefficient (-1.020408164).
Square it (1.041232821) and add it to both sides.

Add '1.041232821' to each side of the equation.
-2.040816327x + 1.041232821 + x2 = -0.612244898 + 1.041232821

Reorder the terms:
1.041232821 + -2.040816327x + x2 = -0.612244898 + 1.041232821

Combine like terms: -0.612244898 + 1.041232821 = 0.428987923
1.041232821 + -2.040816327x + x2 = 0.428987923

Factor a perfect square on the left side:
(x + -1.020408164)(x + -1.020408164) = 0.428987923

Calculate the square root of the right side: 0.654971696

Break this problem into two subproblems by setting 
(x + -1.020408164) equal to 0.654971696 and -0.654971696.

Subproblem 1

x + -1.020408164 = 0.654971696 Simplifying x + -1.020408164 = 0.654971696 Reorder the terms: -1.020408164 + x = 0.654971696 Solving -1.020408164 + x = 0.654971696 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.020408164' to each side of the equation. -1.020408164 + 1.020408164 + x = 0.654971696 + 1.020408164 Combine like terms: -1.020408164 + 1.020408164 = 0.000000000 0.000000000 + x = 0.654971696 + 1.020408164 x = 0.654971696 + 1.020408164 Combine like terms: 0.654971696 + 1.020408164 = 1.67537986 x = 1.67537986 Simplifying x = 1.67537986

Subproblem 2

x + -1.020408164 = -0.654971696 Simplifying x + -1.020408164 = -0.654971696 Reorder the terms: -1.020408164 + x = -0.654971696 Solving -1.020408164 + x = -0.654971696 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.020408164' to each side of the equation. -1.020408164 + 1.020408164 + x = -0.654971696 + 1.020408164 Combine like terms: -1.020408164 + 1.020408164 = 0.000000000 0.000000000 + x = -0.654971696 + 1.020408164 x = -0.654971696 + 1.020408164 Combine like terms: -0.654971696 + 1.020408164 = 0.365436468 x = 0.365436468 Simplifying x = 0.365436468

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.67537986, 0.365436468}

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