7+5x(x+2)=10

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Solution for 7+5x(x+2)=10 equation:


Simplifying
7 + 5x(x + 2) = 10

Reorder the terms:
7 + 5x(2 + x) = 10
7 + (2 * 5x + x * 5x) = 10
7 + (10x + 5x2) = 10

Solving
7 + 10x + 5x2 = 10

Solving for variable 'x'.

Reorder the terms:
7 + -10 + 10x + 5x2 = 10 + -10

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

Combine like terms: 10 + -10 = 0
-3 + 10x + 5x2 = 0

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

Divide each side by '5'.
-0.6 + 2x + x2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + 2x + 0.6 + x2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + 2x + x2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + 2x + x2 = 0 + 0.6
2x + x2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
2x + x2 = 0.6

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 0.6 + 1

Reorder the terms:
1 + 2x + x2 = 0.6 + 1

Combine like terms: 0.6 + 1 = 1.6
1 + 2x + x2 = 1.6

Factor a perfect square on the left side:
(x + 1)(x + 1) = 1.6

Calculate the square root of the right side: 1.264911064

Break this problem into two subproblems by setting 
(x + 1) equal to 1.264911064 and -1.264911064.

Subproblem 1

x + 1 = 1.264911064 Simplifying x + 1 = 1.264911064 Reorder the terms: 1 + x = 1.264911064 Solving 1 + x = 1.264911064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.264911064 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.264911064 + -1 x = 1.264911064 + -1 Combine like terms: 1.264911064 + -1 = 0.264911064 x = 0.264911064 Simplifying x = 0.264911064

Subproblem 2

x + 1 = -1.264911064 Simplifying x + 1 = -1.264911064 Reorder the terms: 1 + x = -1.264911064 Solving 1 + x = -1.264911064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.264911064 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.264911064 + -1 x = -1.264911064 + -1 Combine like terms: -1.264911064 + -1 = -2.264911064 x = -2.264911064 Simplifying x = -2.264911064

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.264911064, -2.264911064}

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