0=150+10x-4.9x^2

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Solution for 0=150+10x-4.9x^2 equation:


Simplifying
0 = 150 + 10x + -4.9x2

Solving
0 = 150 + 10x + -4.9x2

Solving for variable 'x'.

Combine like terms: 0 + -150 = -150
-150 + -10x + 4.9x2 = 150 + 10x + -4.9x2 + -150 + -10x + 4.9x2

Reorder the terms:
-150 + -10x + 4.9x2 = 150 + -150 + 10x + -10x + -4.9x2 + 4.9x2

Combine like terms: 150 + -150 = 0
-150 + -10x + 4.9x2 = 0 + 10x + -10x + -4.9x2 + 4.9x2
-150 + -10x + 4.9x2 = 10x + -10x + -4.9x2 + 4.9x2

Combine like terms: 10x + -10x = 0
-150 + -10x + 4.9x2 = 0 + -4.9x2 + 4.9x2
-150 + -10x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
-150 + -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'.
-30.6122449 + -2.040816327x + x2 = 0

Move the constant term to the right:

Add '30.6122449' to each side of the equation.
-30.6122449 + -2.040816327x + 30.6122449 + x2 = 0 + 30.6122449

Reorder the terms:
-30.6122449 + 30.6122449 + -2.040816327x + x2 = 0 + 30.6122449

Combine like terms: -30.6122449 + 30.6122449 = 0.0000000
0.0000000 + -2.040816327x + x2 = 0 + 30.6122449
-2.040816327x + x2 = 0 + 30.6122449

Combine like terms: 0 + 30.6122449 = 30.6122449
-2.040816327x + x2 = 30.6122449

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 = 30.6122449 + 1.041232821

Reorder the terms:
1.041232821 + -2.040816327x + x2 = 30.6122449 + 1.041232821

Combine like terms: 30.6122449 + 1.041232821 = 31.653477721
1.041232821 + -2.040816327x + x2 = 31.653477721

Factor a perfect square on the left side:
(x + -1.020408164)(x + -1.020408164) = 31.653477721

Calculate the square root of the right side: 5.626142348

Break this problem into two subproblems by setting 
(x + -1.020408164) equal to 5.626142348 and -5.626142348.

Subproblem 1

x + -1.020408164 = 5.626142348 Simplifying x + -1.020408164 = 5.626142348 Reorder the terms: -1.020408164 + x = 5.626142348 Solving -1.020408164 + x = 5.626142348 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 = 5.626142348 + 1.020408164 Combine like terms: -1.020408164 + 1.020408164 = 0.000000000 0.000000000 + x = 5.626142348 + 1.020408164 x = 5.626142348 + 1.020408164 Combine like terms: 5.626142348 + 1.020408164 = 6.646550512 x = 6.646550512 Simplifying x = 6.646550512

Subproblem 2

x + -1.020408164 = -5.626142348 Simplifying x + -1.020408164 = -5.626142348 Reorder the terms: -1.020408164 + x = -5.626142348 Solving -1.020408164 + x = -5.626142348 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 = -5.626142348 + 1.020408164 Combine like terms: -1.020408164 + 1.020408164 = 0.000000000 0.000000000 + x = -5.626142348 + 1.020408164 x = -5.626142348 + 1.020408164 Combine like terms: -5.626142348 + 1.020408164 = -4.605734184 x = -4.605734184 Simplifying x = -4.605734184

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.646550512, -4.605734184}

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