5x^2=40x+16

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Solution for 5x^2=40x+16 equation:


Simplifying
5x2 = 40x + 16

Reorder the terms:
5x2 = 16 + 40x

Solving
5x2 = 16 + 40x

Solving for variable 'x'.

Reorder the terms:
-16 + -40x + 5x2 = 16 + 40x + -16 + -40x

Reorder the terms:
-16 + -40x + 5x2 = 16 + -16 + 40x + -40x

Combine like terms: 16 + -16 = 0
-16 + -40x + 5x2 = 0 + 40x + -40x
-16 + -40x + 5x2 = 40x + -40x

Combine like terms: 40x + -40x = 0
-16 + -40x + 5x2 = 0

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

Divide each side by '5'.
-3.2 + -8x + x2 = 0

Move the constant term to the right:

Add '3.2' to each side of the equation.
-3.2 + -8x + 3.2 + x2 = 0 + 3.2

Reorder the terms:
-3.2 + 3.2 + -8x + x2 = 0 + 3.2

Combine like terms: -3.2 + 3.2 = 0.0
0.0 + -8x + x2 = 0 + 3.2
-8x + x2 = 0 + 3.2

Combine like terms: 0 + 3.2 = 3.2
-8x + x2 = 3.2

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 3.2 + 16

Reorder the terms:
16 + -8x + x2 = 3.2 + 16

Combine like terms: 3.2 + 16 = 19.2
16 + -8x + x2 = 19.2

Factor a perfect square on the left side:
(x + -4)(x + -4) = 19.2

Calculate the square root of the right side: 4.38178046

Break this problem into two subproblems by setting 
(x + -4) equal to 4.38178046 and -4.38178046.

Subproblem 1

x + -4 = 4.38178046 Simplifying x + -4 = 4.38178046 Reorder the terms: -4 + x = 4.38178046 Solving -4 + x = 4.38178046 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 4.38178046 + 4 Combine like terms: -4 + 4 = 0 0 + x = 4.38178046 + 4 x = 4.38178046 + 4 Combine like terms: 4.38178046 + 4 = 8.38178046 x = 8.38178046 Simplifying x = 8.38178046

Subproblem 2

x + -4 = -4.38178046 Simplifying x + -4 = -4.38178046 Reorder the terms: -4 + x = -4.38178046 Solving -4 + x = -4.38178046 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -4.38178046 + 4 Combine like terms: -4 + 4 = 0 0 + x = -4.38178046 + 4 x = -4.38178046 + 4 Combine like terms: -4.38178046 + 4 = -0.38178046 x = -0.38178046 Simplifying x = -0.38178046

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.38178046, -0.38178046}

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