4x^2+3x-225=0

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Solution for 4x^2+3x-225=0 equation:


Simplifying
4x2 + 3x + -225 = 0

Reorder the terms:
-225 + 3x + 4x2 = 0

Solving
-225 + 3x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-56.25 + 0.75x + x2 = 0

Move the constant term to the right:

Add '56.25' to each side of the equation.
-56.25 + 0.75x + 56.25 + x2 = 0 + 56.25

Reorder the terms:
-56.25 + 56.25 + 0.75x + x2 = 0 + 56.25

Combine like terms: -56.25 + 56.25 = 0.00
0.00 + 0.75x + x2 = 0 + 56.25
0.75x + x2 = 0 + 56.25

Combine like terms: 0 + 56.25 = 56.25
0.75x + x2 = 56.25

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 56.25 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 56.25 + 0.140625

Combine like terms: 56.25 + 0.140625 = 56.390625
0.140625 + 0.75x + x2 = 56.390625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 56.390625

Calculate the square root of the right side: 7.509369148

Break this problem into two subproblems by setting 
(x + 0.375) equal to 7.509369148 and -7.509369148.

Subproblem 1

x + 0.375 = 7.509369148 Simplifying x + 0.375 = 7.509369148 Reorder the terms: 0.375 + x = 7.509369148 Solving 0.375 + x = 7.509369148 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 7.509369148 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 7.509369148 + -0.375 x = 7.509369148 + -0.375 Combine like terms: 7.509369148 + -0.375 = 7.134369148 x = 7.134369148 Simplifying x = 7.134369148

Subproblem 2

x + 0.375 = -7.509369148 Simplifying x + 0.375 = -7.509369148 Reorder the terms: 0.375 + x = -7.509369148 Solving 0.375 + x = -7.509369148 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -7.509369148 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -7.509369148 + -0.375 x = -7.509369148 + -0.375 Combine like terms: -7.509369148 + -0.375 = -7.884369148 x = -7.884369148 Simplifying x = -7.884369148

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.134369148, -7.884369148}

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