(x-3)(x+6)=10(28)

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Solution for (x-3)(x+6)=10(28) equation:


Simplifying
(x + -3)(x + 6) = 10(28)

Reorder the terms:
(-3 + x)(x + 6) = 10(28)

Reorder the terms:
(-3 + x)(6 + x) = 10(28)

Multiply (-3 + x) * (6 + x)
(-3(6 + x) + x(6 + x)) = 10(28)
((6 * -3 + x * -3) + x(6 + x)) = 10(28)
((-18 + -3x) + x(6 + x)) = 10(28)
(-18 + -3x + (6 * x + x * x)) = 10(28)
(-18 + -3x + (6x + x2)) = 10(28)

Combine like terms: -3x + 6x = 3x
(-18 + 3x + x2) = 10(28)

Multiply 10 * 28
-18 + 3x + x2 = 280

Solving
-18 + 3x + x2 = 280

Solving for variable 'x'.

Reorder the terms:
-18 + -280 + 3x + x2 = 280 + -280

Combine like terms: -18 + -280 = -298
-298 + 3x + x2 = 280 + -280

Combine like terms: 280 + -280 = 0
-298 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '298' to each side of the equation.
-298 + 3x + 298 + x2 = 0 + 298

Reorder the terms:
-298 + 298 + 3x + x2 = 0 + 298

Combine like terms: -298 + 298 = 0
0 + 3x + x2 = 0 + 298
3x + x2 = 0 + 298

Combine like terms: 0 + 298 = 298
3x + x2 = 298

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 = 298 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 298 + 2.25

Combine like terms: 298 + 2.25 = 300.25
2.25 + 3x + x2 = 300.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 300.25

Calculate the square root of the right side: 17.327723451

Break this problem into two subproblems by setting 
(x + 1.5) equal to 17.327723451 and -17.327723451.

Subproblem 1

x + 1.5 = 17.327723451 Simplifying x + 1.5 = 17.327723451 Reorder the terms: 1.5 + x = 17.327723451 Solving 1.5 + x = 17.327723451 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 = 17.327723451 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 17.327723451 + -1.5 x = 17.327723451 + -1.5 Combine like terms: 17.327723451 + -1.5 = 15.827723451 x = 15.827723451 Simplifying x = 15.827723451

Subproblem 2

x + 1.5 = -17.327723451 Simplifying x + 1.5 = -17.327723451 Reorder the terms: 1.5 + x = -17.327723451 Solving 1.5 + x = -17.327723451 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 = -17.327723451 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -17.327723451 + -1.5 x = -17.327723451 + -1.5 Combine like terms: -17.327723451 + -1.5 = -18.827723451 x = -18.827723451 Simplifying x = -18.827723451

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.827723451, -18.827723451}

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