4x^2+10x+25=300

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Solution for 4x^2+10x+25=300 equation:


Simplifying
4x2 + 10x + 25 = 300

Reorder the terms:
25 + 10x + 4x2 = 300

Solving
25 + 10x + 4x2 = 300

Solving for variable 'x'.

Reorder the terms:
25 + -300 + 10x + 4x2 = 300 + -300

Combine like terms: 25 + -300 = -275
-275 + 10x + 4x2 = 300 + -300

Combine like terms: 300 + -300 = 0
-275 + 10x + 4x2 = 0

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

Divide each side by '4'.
-68.75 + 2.5x + x2 = 0

Move the constant term to the right:

Add '68.75' to each side of the equation.
-68.75 + 2.5x + 68.75 + x2 = 0 + 68.75

Reorder the terms:
-68.75 + 68.75 + 2.5x + x2 = 0 + 68.75

Combine like terms: -68.75 + 68.75 = 0.00
0.00 + 2.5x + x2 = 0 + 68.75
2.5x + x2 = 0 + 68.75

Combine like terms: 0 + 68.75 = 68.75
2.5x + x2 = 68.75

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 68.75 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 68.75 + 1.5625

Combine like terms: 68.75 + 1.5625 = 70.3125
1.5625 + 2.5x + x2 = 70.3125

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 70.3125

Calculate the square root of the right side: 8.385254916

Break this problem into two subproblems by setting 
(x + 1.25) equal to 8.385254916 and -8.385254916.

Subproblem 1

x + 1.25 = 8.385254916 Simplifying x + 1.25 = 8.385254916 Reorder the terms: 1.25 + x = 8.385254916 Solving 1.25 + x = 8.385254916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 8.385254916 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 8.385254916 + -1.25 x = 8.385254916 + -1.25 Combine like terms: 8.385254916 + -1.25 = 7.135254916 x = 7.135254916 Simplifying x = 7.135254916

Subproblem 2

x + 1.25 = -8.385254916 Simplifying x + 1.25 = -8.385254916 Reorder the terms: 1.25 + x = -8.385254916 Solving 1.25 + x = -8.385254916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -8.385254916 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -8.385254916 + -1.25 x = -8.385254916 + -1.25 Combine like terms: -8.385254916 + -1.25 = -9.635254916 x = -9.635254916 Simplifying x = -9.635254916

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.135254916, -9.635254916}

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