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 = 1.653477719
1.041232821 + 2.040816327x + x2 = 1.653477719

Factor a perfect square on the left side:
(x + 1.020408164)(x + 1.020408164) = 1.653477719

Calculate the square root of the right side: 1.285876246

Break this problem into two subproblems by setting 
(x + 1.020408164) equal to 1.285876246 and -1.285876246.

Subproblem 1

x + 1.020408164 = 1.285876246 Simplifying x + 1.020408164 = 1.285876246 Reorder the terms: 1.020408164 + x = 1.285876246 Solving 1.020408164 + x = 1.285876246 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 = 1.285876246 + -1.020408164 Combine like terms: 1.020408164 + -1.020408164 = 0.000000000 0.000000000 + x = 1.285876246 + -1.020408164 x = 1.285876246 + -1.020408164 Combine like terms: 1.285876246 + -1.020408164 = 0.265468082 x = 0.265468082 Simplifying x = 0.265468082

Subproblem 2

x + 1.020408164 = -1.285876246 Simplifying x + 1.020408164 = -1.285876246 Reorder the terms: 1.020408164 + x = -1.285876246 Solving 1.020408164 + x = -1.285876246 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 = -1.285876246 + -1.020408164 Combine like terms: 1.020408164 + -1.020408164 = 0.000000000 0.000000000 + x = -1.285876246 + -1.020408164 x = -1.285876246 + -1.020408164 Combine like terms: -1.285876246 + -1.020408164 = -2.30628441 x = -2.30628441 Simplifying x = -2.30628441

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.265468082, -2.30628441}

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