f(0)=4x^2+8x-3

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Solution for f(0)=4x^2+8x-3 equation:


Simplifying
f(0) = 4x2 + 8x + -3

Reorder the terms for easier multiplication:
0f = 4x2 + 8x + -3

Anything times zero is zero.
0f = 4x2 + 8x + -3

Reorder the terms:
0 = -3 + 8x + 4x2

Solving
0 = -3 + 8x + 4x2

Solving for variable 'x'.

Combine like terms: 0 + 3 = 3
3 + -8x + -4x2 = -3 + 8x + 4x2 + 3 + -8x + -4x2

Reorder the terms:
3 + -8x + -4x2 = -3 + 3 + 8x + -8x + 4x2 + -4x2

Combine like terms: -3 + 3 = 0
3 + -8x + -4x2 = 0 + 8x + -8x + 4x2 + -4x2
3 + -8x + -4x2 = 8x + -8x + 4x2 + -4x2

Combine like terms: 8x + -8x = 0
3 + -8x + -4x2 = 0 + 4x2 + -4x2
3 + -8x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
3 + -8x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-0.75 + 2x + x2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + 2x + 0.75 + x2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + 2x + x2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + 2x + x2 = 0 + 0.75
2x + x2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
2x + x2 = 0.75

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 = 0.75 + 1

Reorder the terms:
1 + 2x + x2 = 0.75 + 1

Combine like terms: 0.75 + 1 = 1.75
1 + 2x + x2 = 1.75

Factor a perfect square on the left side:
(x + 1)(x + 1) = 1.75

Calculate the square root of the right side: 1.322875656

Break this problem into two subproblems by setting 
(x + 1) equal to 1.322875656 and -1.322875656.

Subproblem 1

x + 1 = 1.322875656 Simplifying x + 1 = 1.322875656 Reorder the terms: 1 + x = 1.322875656 Solving 1 + x = 1.322875656 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 = 1.322875656 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.322875656 + -1 x = 1.322875656 + -1 Combine like terms: 1.322875656 + -1 = 0.322875656 x = 0.322875656 Simplifying x = 0.322875656

Subproblem 2

x + 1 = -1.322875656 Simplifying x + 1 = -1.322875656 Reorder the terms: 1 + x = -1.322875656 Solving 1 + x = -1.322875656 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 = -1.322875656 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.322875656 + -1 x = -1.322875656 + -1 Combine like terms: -1.322875656 + -1 = -2.322875656 x = -2.322875656 Simplifying x = -2.322875656

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.322875656, -2.322875656}

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