4x^2+5x=100

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Solution for 4x^2+5x=100 equation:


Simplifying
4x2 + 5x = 100

Reorder the terms:
5x + 4x2 = 100

Solving
5x + 4x2 = 100

Solving for variable 'x'.

Reorder the terms:
-100 + 5x + 4x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + 5x + 4x2 = 0

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

Divide each side by '4'.
-25 + 1.25x + x2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 1.25x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + 1.25x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 1.25x + x2 = 0 + 25
1.25x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
1.25x + x2 = 25

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 25 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 25 + 0.390625

Combine like terms: 25 + 0.390625 = 25.390625
0.390625 + 1.25x + x2 = 25.390625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 25.390625

Calculate the square root of the right side: 5.038911093

Break this problem into two subproblems by setting 
(x + 0.625) equal to 5.038911093 and -5.038911093.

Subproblem 1

x + 0.625 = 5.038911093 Simplifying x + 0.625 = 5.038911093 Reorder the terms: 0.625 + x = 5.038911093 Solving 0.625 + x = 5.038911093 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 5.038911093 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 5.038911093 + -0.625 x = 5.038911093 + -0.625 Combine like terms: 5.038911093 + -0.625 = 4.413911093 x = 4.413911093 Simplifying x = 4.413911093

Subproblem 2

x + 0.625 = -5.038911093 Simplifying x + 0.625 = -5.038911093 Reorder the terms: 0.625 + x = -5.038911093 Solving 0.625 + x = -5.038911093 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -5.038911093 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -5.038911093 + -0.625 x = -5.038911093 + -0.625 Combine like terms: -5.038911093 + -0.625 = -5.663911093 x = -5.663911093 Simplifying x = -5.663911093

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.413911093, -5.663911093}

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