(x+2)(x-5)=7

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Solution for (x+2)(x-5)=7 equation:


Simplifying
(x + 2)(x + -5) = 7

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

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

Multiply (2 + x) * (-5 + x)
(2(-5 + x) + x(-5 + x)) = 7
((-5 * 2 + x * 2) + x(-5 + x)) = 7
((-10 + 2x) + x(-5 + x)) = 7
(-10 + 2x + (-5 * x + x * x)) = 7
(-10 + 2x + (-5x + x2)) = 7

Combine like terms: 2x + -5x = -3x
(-10 + -3x + x2) = 7

Solving
-10 + -3x + x2 = 7

Solving for variable 'x'.

Reorder the terms:
-10 + -7 + -3x + x2 = 7 + -7

Combine like terms: -10 + -7 = -17
-17 + -3x + x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-17 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '17' to each side of the equation.
-17 + -3x + 17 + x2 = 0 + 17

Reorder the terms:
-17 + 17 + -3x + x2 = 0 + 17

Combine like terms: -17 + 17 = 0
0 + -3x + x2 = 0 + 17
-3x + x2 = 0 + 17

Combine like terms: 0 + 17 = 17
-3x + x2 = 17

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 17 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 17 + 2.25

Combine like terms: 17 + 2.25 = 19.25
2.25 + -3x + x2 = 19.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 19.25

Calculate the square root of the right side: 4.387482194

Break this problem into two subproblems by setting 
(x + -1.5) equal to 4.387482194 and -4.387482194.

Subproblem 1

x + -1.5 = 4.387482194 Simplifying x + -1.5 = 4.387482194 Reorder the terms: -1.5 + x = 4.387482194 Solving -1.5 + x = 4.387482194 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 4.387482194 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 4.387482194 + 1.5 x = 4.387482194 + 1.5 Combine like terms: 4.387482194 + 1.5 = 5.887482194 x = 5.887482194 Simplifying x = 5.887482194

Subproblem 2

x + -1.5 = -4.387482194 Simplifying x + -1.5 = -4.387482194 Reorder the terms: -1.5 + x = -4.387482194 Solving -1.5 + x = -4.387482194 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -4.387482194 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -4.387482194 + 1.5 x = -4.387482194 + 1.5 Combine like terms: -4.387482194 + 1.5 = -2.887482194 x = -2.887482194 Simplifying x = -2.887482194

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.887482194, -2.887482194}

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