(5x-4)(x+10)=7

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Solution for (5x-4)(x+10)=7 equation:


Simplifying
(5x + -4)(x + 10) = 7

Reorder the terms:
(-4 + 5x)(x + 10) = 7

Reorder the terms:
(-4 + 5x)(10 + x) = 7

Multiply (-4 + 5x) * (10 + x)
(-4(10 + x) + 5x * (10 + x)) = 7
((10 * -4 + x * -4) + 5x * (10 + x)) = 7
((-40 + -4x) + 5x * (10 + x)) = 7
(-40 + -4x + (10 * 5x + x * 5x)) = 7
(-40 + -4x + (50x + 5x2)) = 7

Combine like terms: -4x + 50x = 46x
(-40 + 46x + 5x2) = 7

Solving
-40 + 46x + 5x2 = 7

Solving for variable 'x'.

Reorder the terms:
-40 + -7 + 46x + 5x2 = 7 + -7

Combine like terms: -40 + -7 = -47
-47 + 46x + 5x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-47 + 46x + 5x2 = 0

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

Divide each side by '5'.
-9.4 + 9.2x + x2 = 0

Move the constant term to the right:

Add '9.4' to each side of the equation.
-9.4 + 9.2x + 9.4 + x2 = 0 + 9.4

Reorder the terms:
-9.4 + 9.4 + 9.2x + x2 = 0 + 9.4

Combine like terms: -9.4 + 9.4 = 0.0
0.0 + 9.2x + x2 = 0 + 9.4
9.2x + x2 = 0 + 9.4

Combine like terms: 0 + 9.4 = 9.4
9.2x + x2 = 9.4

The x term is 9.2x.  Take half its coefficient (4.6).
Square it (21.16) and add it to both sides.

Add '21.16' to each side of the equation.
9.2x + 21.16 + x2 = 9.4 + 21.16

Reorder the terms:
21.16 + 9.2x + x2 = 9.4 + 21.16

Combine like terms: 9.4 + 21.16 = 30.56
21.16 + 9.2x + x2 = 30.56

Factor a perfect square on the left side:
(x + 4.6)(x + 4.6) = 30.56

Calculate the square root of the right side: 5.528109984

Break this problem into two subproblems by setting 
(x + 4.6) equal to 5.528109984 and -5.528109984.

Subproblem 1

x + 4.6 = 5.528109984 Simplifying x + 4.6 = 5.528109984 Reorder the terms: 4.6 + x = 5.528109984 Solving 4.6 + x = 5.528109984 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.6' to each side of the equation. 4.6 + -4.6 + x = 5.528109984 + -4.6 Combine like terms: 4.6 + -4.6 = 0.0 0.0 + x = 5.528109984 + -4.6 x = 5.528109984 + -4.6 Combine like terms: 5.528109984 + -4.6 = 0.928109984 x = 0.928109984 Simplifying x = 0.928109984

Subproblem 2

x + 4.6 = -5.528109984 Simplifying x + 4.6 = -5.528109984 Reorder the terms: 4.6 + x = -5.528109984 Solving 4.6 + x = -5.528109984 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.6' to each side of the equation. 4.6 + -4.6 + x = -5.528109984 + -4.6 Combine like terms: 4.6 + -4.6 = 0.0 0.0 + x = -5.528109984 + -4.6 x = -5.528109984 + -4.6 Combine like terms: -5.528109984 + -4.6 = -10.128109984 x = -10.128109984 Simplifying x = -10.128109984

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.928109984, -10.128109984}

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