(4x-3)(x+5)=10

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Solution for (4x-3)(x+5)=10 equation:


Simplifying
(4x + -3)(x + 5) = 10

Reorder the terms:
(-3 + 4x)(x + 5) = 10

Reorder the terms:
(-3 + 4x)(5 + x) = 10

Multiply (-3 + 4x) * (5 + x)
(-3(5 + x) + 4x * (5 + x)) = 10
((5 * -3 + x * -3) + 4x * (5 + x)) = 10
((-15 + -3x) + 4x * (5 + x)) = 10
(-15 + -3x + (5 * 4x + x * 4x)) = 10
(-15 + -3x + (20x + 4x2)) = 10

Combine like terms: -3x + 20x = 17x
(-15 + 17x + 4x2) = 10

Solving
-15 + 17x + 4x2 = 10

Solving for variable 'x'.

Reorder the terms:
-15 + -10 + 17x + 4x2 = 10 + -10

Combine like terms: -15 + -10 = -25
-25 + 17x + 4x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-25 + 17x + 4x2 = 0

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

Divide each side by '4'.
-6.25 + 4.25x + x2 = 0

Move the constant term to the right:

Add '6.25' to each side of the equation.
-6.25 + 4.25x + 6.25 + x2 = 0 + 6.25

Reorder the terms:
-6.25 + 6.25 + 4.25x + x2 = 0 + 6.25

Combine like terms: -6.25 + 6.25 = 0.00
0.00 + 4.25x + x2 = 0 + 6.25
4.25x + x2 = 0 + 6.25

Combine like terms: 0 + 6.25 = 6.25
4.25x + x2 = 6.25

The x term is 4.25x.  Take half its coefficient (2.125).
Square it (4.515625) and add it to both sides.

Add '4.515625' to each side of the equation.
4.25x + 4.515625 + x2 = 6.25 + 4.515625

Reorder the terms:
4.515625 + 4.25x + x2 = 6.25 + 4.515625

Combine like terms: 6.25 + 4.515625 = 10.765625
4.515625 + 4.25x + x2 = 10.765625

Factor a perfect square on the left side:
(x + 2.125)(x + 2.125) = 10.765625

Calculate the square root of the right side: 3.281101187

Break this problem into two subproblems by setting 
(x + 2.125) equal to 3.281101187 and -3.281101187.

Subproblem 1

x + 2.125 = 3.281101187 Simplifying x + 2.125 = 3.281101187 Reorder the terms: 2.125 + x = 3.281101187 Solving 2.125 + x = 3.281101187 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.125' to each side of the equation. 2.125 + -2.125 + x = 3.281101187 + -2.125 Combine like terms: 2.125 + -2.125 = 0.000 0.000 + x = 3.281101187 + -2.125 x = 3.281101187 + -2.125 Combine like terms: 3.281101187 + -2.125 = 1.156101187 x = 1.156101187 Simplifying x = 1.156101187

Subproblem 2

x + 2.125 = -3.281101187 Simplifying x + 2.125 = -3.281101187 Reorder the terms: 2.125 + x = -3.281101187 Solving 2.125 + x = -3.281101187 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.125' to each side of the equation. 2.125 + -2.125 + x = -3.281101187 + -2.125 Combine like terms: 2.125 + -2.125 = 0.000 0.000 + x = -3.281101187 + -2.125 x = -3.281101187 + -2.125 Combine like terms: -3.281101187 + -2.125 = -5.406101187 x = -5.406101187 Simplifying x = -5.406101187

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.156101187, -5.406101187}

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