45=5x^2+23x

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Solution for 45=5x^2+23x equation:


Simplifying
45 = 5x2 + 23x

Reorder the terms:
45 = 23x + 5x2

Solving
45 = 23x + 5x2

Solving for variable 'x'.

Reorder the terms:
45 + -23x + -5x2 = 23x + -23x + 5x2 + -5x2

Combine like terms: 23x + -23x = 0
45 + -23x + -5x2 = 0 + 5x2 + -5x2
45 + -23x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
45 + -23x + -5x2 = 0

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

Divide each side by '-5'.
-9 + 4.6x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 4.6x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 4.6x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 4.6x + x2 = 0 + 9
4.6x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
4.6x + x2 = 9

The x term is 4.6x.  Take half its coefficient (2.3).
Square it (5.29) and add it to both sides.

Add '5.29' to each side of the equation.
4.6x + 5.29 + x2 = 9 + 5.29

Reorder the terms:
5.29 + 4.6x + x2 = 9 + 5.29

Combine like terms: 9 + 5.29 = 14.29
5.29 + 4.6x + x2 = 14.29

Factor a perfect square on the left side:
(x + 2.3)(x + 2.3) = 14.29

Calculate the square root of the right side: 3.780211634

Break this problem into two subproblems by setting 
(x + 2.3) equal to 3.780211634 and -3.780211634.

Subproblem 1

x + 2.3 = 3.780211634 Simplifying x + 2.3 = 3.780211634 Reorder the terms: 2.3 + x = 3.780211634 Solving 2.3 + x = 3.780211634 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.3' to each side of the equation. 2.3 + -2.3 + x = 3.780211634 + -2.3 Combine like terms: 2.3 + -2.3 = 0.0 0.0 + x = 3.780211634 + -2.3 x = 3.780211634 + -2.3 Combine like terms: 3.780211634 + -2.3 = 1.480211634 x = 1.480211634 Simplifying x = 1.480211634

Subproblem 2

x + 2.3 = -3.780211634 Simplifying x + 2.3 = -3.780211634 Reorder the terms: 2.3 + x = -3.780211634 Solving 2.3 + x = -3.780211634 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.3' to each side of the equation. 2.3 + -2.3 + x = -3.780211634 + -2.3 Combine like terms: 2.3 + -2.3 = 0.0 0.0 + x = -3.780211634 + -2.3 x = -3.780211634 + -2.3 Combine like terms: -3.780211634 + -2.3 = -6.080211634 x = -6.080211634 Simplifying x = -6.080211634

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.480211634, -6.080211634}

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