(-4x^2)+(40x)+25=20

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Solution for (-4x^2)+(40x)+25=20 equation:


Simplifying
(-4x2) + (40x) + 25 = 20

Reorder the terms:
25 + (40x) + (-4x2) = 20

Solving
25 + (40x) + (-4x2) = 20

Solving for variable 'x'.

Reorder the terms:
25 + -20 + (40x) + (-4x2) = 20 + -20

Combine like terms: 25 + -20 = 5
5 + (40x) + (-4x2) = 20 + -20

Combine like terms: 20 + -20 = 0
5 + (40x) + (-4x2) = 0

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

Divide each side by '-4'.
-1.25 + (-10x) + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + (-10x) + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + (-10x) + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + (-10x) + x2 = 0 + 1.25
(-10x) + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
(-10x) + x2 = 1.25

The x term is (-10x).  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
(-10x) + 25 + x2 = 1.25 + 25

Reorder the terms:
25 + (-10x) + x2 = 1.25 + 25

Combine like terms: 1.25 + 25 = 26.25
25 + (-10x) + x2 = 26.25

Factor a perfect square on the left side:
((x) + -5)((x) + -5) = 26.25

Calculate the square root of the right side: 5.123475383

Break this problem into two subproblems by setting 
((x) + -5) equal to 5.123475383 and -5.123475383.

Subproblem 1

(x) + -5 = 5.123475383 Simplifying (x) + -5 = 5.123475383 x + -5 = 5.123475383 Reorder the terms: -5 + x = 5.123475383 Solving -5 + x = 5.123475383 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 5.123475383 + 5 Combine like terms: -5 + 5 = 0 0 + x = 5.123475383 + 5 x = 5.123475383 + 5 Combine like terms: 5.123475383 + 5 = 10.123475383 x = 10.123475383 Simplifying x = 10.123475383

Subproblem 2

(x) + -5 = -5.123475383 Simplifying (x) + -5 = -5.123475383 x + -5 = -5.123475383 Reorder the terms: -5 + x = -5.123475383 Solving -5 + x = -5.123475383 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -5.123475383 + 5 Combine like terms: -5 + 5 = 0 0 + x = -5.123475383 + 5 x = -5.123475383 + 5 Combine like terms: -5.123475383 + 5 = -0.123475383 x = -0.123475383 Simplifying x = -0.123475383

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.123475383, -0.123475383}

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