1.5x^2+15x=36

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Solution for 1.5x^2+15x=36 equation:


Simplifying
1.5x2 + 15x = 36

Reorder the terms:
15x + 1.5x2 = 36

Solving
15x + 1.5x2 = 36

Solving for variable 'x'.

Reorder the terms:
-36 + 15x + 1.5x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-36 + 15x + 1.5x2 = 0

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

Divide each side by '1.5'.
-24 + 10x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 10x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + 10x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 10x + x2 = 0 + 24
10x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
10x + x2 = 24

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 24 + 25

Reorder the terms:
25 + 10x + x2 = 24 + 25

Combine like terms: 24 + 25 = 49
25 + 10x + x2 = 49

Factor a perfect square on the left side:
(x + 5)(x + 5) = 49

Calculate the square root of the right side: 7

Break this problem into two subproblems by setting 
(x + 5) equal to 7 and -7.

Subproblem 1

x + 5 = 7 Simplifying x + 5 = 7 Reorder the terms: 5 + x = 7 Solving 5 + x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 7 + -5 Combine like terms: 5 + -5 = 0 0 + x = 7 + -5 x = 7 + -5 Combine like terms: 7 + -5 = 2 x = 2 Simplifying x = 2

Subproblem 2

x + 5 = -7 Simplifying x + 5 = -7 Reorder the terms: 5 + x = -7 Solving 5 + x = -7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -7 + -5 Combine like terms: 5 + -5 = 0 0 + x = -7 + -5 x = -7 + -5 Combine like terms: -7 + -5 = -12 x = -12 Simplifying x = -12

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2, -12}

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