34.3=-4.9x^2+39.2x

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Solution for 34.3=-4.9x^2+39.2x equation:


Simplifying
34.3 = -4.9x2 + 39.2x

Reorder the terms:
34.3 = 39.2x + -4.9x2

Solving
34.3 = 39.2x + -4.9x2

Solving for variable 'x'.

Reorder the terms:
34.3 + -39.2x + 4.9x2 = 39.2x + -39.2x + -4.9x2 + 4.9x2

Combine like terms: 39.2x + -39.2x = 0.0
34.3 + -39.2x + 4.9x2 = 0.0 + -4.9x2 + 4.9x2
34.3 + -39.2x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
34.3 + -39.2x + 4.9x2 = 0.0

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

Divide each side by '4.9'.
7 + -8x + x2 = 0

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -8x + -7 + x2 = 0 + -7

Reorder the terms:
7 + -7 + -8x + x2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -8x + x2 = 0 + -7
-8x + x2 = 0 + -7

Combine like terms: 0 + -7 = -7
-8x + x2 = -7

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -7 + 16

Reorder the terms:
16 + -8x + x2 = -7 + 16

Combine like terms: -7 + 16 = 9
16 + -8x + x2 = 9

Factor a perfect square on the left side:
(x + -4)(x + -4) = 9

Calculate the square root of the right side: 3

Break this problem into two subproblems by setting 
(x + -4) equal to 3 and -3.

Subproblem 1

x + -4 = 3 Simplifying x + -4 = 3 Reorder the terms: -4 + x = 3 Solving -4 + x = 3 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 3 + 4 Combine like terms: -4 + 4 = 0 0 + x = 3 + 4 x = 3 + 4 Combine like terms: 3 + 4 = 7 x = 7 Simplifying x = 7

Subproblem 2

x + -4 = -3 Simplifying x + -4 = -3 Reorder the terms: -4 + x = -3 Solving -4 + x = -3 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -3 + 4 Combine like terms: -4 + 4 = 0 0 + x = -3 + 4 x = -3 + 4 Combine like terms: -3 + 4 = 1 x = 1 Simplifying x = 1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7, 1}

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