2x+30=-0.05x^2+1.5x+48.75

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Solution for 2x+30=-0.05x^2+1.5x+48.75 equation:


Simplifying
2x + 30 = -0.05x2 + 1.5x + 48.75

Reorder the terms:
30 + 2x = -0.05x2 + 1.5x + 48.75

Reorder the terms:
30 + 2x = 48.75 + 1.5x + -0.05x2

Solving
30 + 2x = 48.75 + 1.5x + -0.05x2

Solving for variable 'x'.

Reorder the terms:
30 + -48.75 + 2x + -1.5x + 0.05x2 = 48.75 + 1.5x + -0.05x2 + -48.75 + -1.5x + 0.05x2

Combine like terms: 30 + -48.75 = -18.75
-18.75 + 2x + -1.5x + 0.05x2 = 48.75 + 1.5x + -0.05x2 + -48.75 + -1.5x + 0.05x2

Combine like terms: 2x + -1.5x = 0.5x
-18.75 + 0.5x + 0.05x2 = 48.75 + 1.5x + -0.05x2 + -48.75 + -1.5x + 0.05x2

Reorder the terms:
-18.75 + 0.5x + 0.05x2 = 48.75 + -48.75 + 1.5x + -1.5x + -0.05x2 + 0.05x2

Combine like terms: 48.75 + -48.75 = 0.00
-18.75 + 0.5x + 0.05x2 = 0.00 + 1.5x + -1.5x + -0.05x2 + 0.05x2
-18.75 + 0.5x + 0.05x2 = 1.5x + -1.5x + -0.05x2 + 0.05x2

Combine like terms: 1.5x + -1.5x = 0.0
-18.75 + 0.5x + 0.05x2 = 0.0 + -0.05x2 + 0.05x2
-18.75 + 0.5x + 0.05x2 = -0.05x2 + 0.05x2

Combine like terms: -0.05x2 + 0.05x2 = 0.00
-18.75 + 0.5x + 0.05x2 = 0.00

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

Divide each side by '0.05'.
-375 + 10x + x2 = 0

Move the constant term to the right:

Add '375' to each side of the equation.
-375 + 10x + 375 + x2 = 0 + 375

Reorder the terms:
-375 + 375 + 10x + x2 = 0 + 375

Combine like terms: -375 + 375 = 0
0 + 10x + x2 = 0 + 375
10x + x2 = 0 + 375

Combine like terms: 0 + 375 = 375
10x + x2 = 375

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 = 375 + 25

Reorder the terms:
25 + 10x + x2 = 375 + 25

Combine like terms: 375 + 25 = 400
25 + 10x + x2 = 400

Factor a perfect square on the left side:
(x + 5)(x + 5) = 400

Calculate the square root of the right side: 20

Break this problem into two subproblems by setting 
(x + 5) equal to 20 and -20.

Subproblem 1

x + 5 = 20 Simplifying x + 5 = 20 Reorder the terms: 5 + x = 20 Solving 5 + x = 20 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 = 20 + -5 Combine like terms: 5 + -5 = 0 0 + x = 20 + -5 x = 20 + -5 Combine like terms: 20 + -5 = 15 x = 15 Simplifying x = 15

Subproblem 2

x + 5 = -20 Simplifying x + 5 = -20 Reorder the terms: 5 + x = -20 Solving 5 + x = -20 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 = -20 + -5 Combine like terms: 5 + -5 = 0 0 + x = -20 + -5 x = -20 + -5 Combine like terms: -20 + -5 = -25 x = -25 Simplifying x = -25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15, -25}

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