10x^2+7x+4=17

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Solution for 10x^2+7x+4=17 equation:


Simplifying
10x2 + 7x + 4 = 17

Reorder the terms:
4 + 7x + 10x2 = 17

Solving
4 + 7x + 10x2 = 17

Solving for variable 'x'.

Reorder the terms:
4 + -17 + 7x + 10x2 = 17 + -17

Combine like terms: 4 + -17 = -13
-13 + 7x + 10x2 = 17 + -17

Combine like terms: 17 + -17 = 0
-13 + 7x + 10x2 = 0

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

Divide each side by '10'.
-1.3 + 0.7x + x2 = 0

Move the constant term to the right:

Add '1.3' to each side of the equation.
-1.3 + 0.7x + 1.3 + x2 = 0 + 1.3

Reorder the terms:
-1.3 + 1.3 + 0.7x + x2 = 0 + 1.3

Combine like terms: -1.3 + 1.3 = 0.0
0.0 + 0.7x + x2 = 0 + 1.3
0.7x + x2 = 0 + 1.3

Combine like terms: 0 + 1.3 = 1.3
0.7x + x2 = 1.3

The x term is 0.7x.  Take half its coefficient (0.35).
Square it (0.1225) and add it to both sides.

Add '0.1225' to each side of the equation.
0.7x + 0.1225 + x2 = 1.3 + 0.1225

Reorder the terms:
0.1225 + 0.7x + x2 = 1.3 + 0.1225

Combine like terms: 1.3 + 0.1225 = 1.4225
0.1225 + 0.7x + x2 = 1.4225

Factor a perfect square on the left side:
(x + 0.35)(x + 0.35) = 1.4225

Calculate the square root of the right side: 1.192686044

Break this problem into two subproblems by setting 
(x + 0.35) equal to 1.192686044 and -1.192686044.

Subproblem 1

x + 0.35 = 1.192686044 Simplifying x + 0.35 = 1.192686044 Reorder the terms: 0.35 + x = 1.192686044 Solving 0.35 + x = 1.192686044 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.35' to each side of the equation. 0.35 + -0.35 + x = 1.192686044 + -0.35 Combine like terms: 0.35 + -0.35 = 0.00 0.00 + x = 1.192686044 + -0.35 x = 1.192686044 + -0.35 Combine like terms: 1.192686044 + -0.35 = 0.842686044 x = 0.842686044 Simplifying x = 0.842686044

Subproblem 2

x + 0.35 = -1.192686044 Simplifying x + 0.35 = -1.192686044 Reorder the terms: 0.35 + x = -1.192686044 Solving 0.35 + x = -1.192686044 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.35' to each side of the equation. 0.35 + -0.35 + x = -1.192686044 + -0.35 Combine like terms: 0.35 + -0.35 = 0.00 0.00 + x = -1.192686044 + -0.35 x = -1.192686044 + -0.35 Combine like terms: -1.192686044 + -0.35 = -1.542686044 x = -1.542686044 Simplifying x = -1.542686044

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.842686044, -1.542686044}

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