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Simplifying 5x2 + 4x + -72 = 0 Reorder the terms: -72 + 4x + 5x2 = 0 Solving -72 + 4x + 5x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -14.4 + 0.8x + x2 = 0 Move the constant term to the right: Add '14.4' to each side of the equation. -14.4 + 0.8x + 14.4 + x2 = 0 + 14.4 Reorder the terms: -14.4 + 14.4 + 0.8x + x2 = 0 + 14.4 Combine like terms: -14.4 + 14.4 = 0.0 0.0 + 0.8x + x2 = 0 + 14.4 0.8x + x2 = 0 + 14.4 Combine like terms: 0 + 14.4 = 14.4 0.8x + x2 = 14.4 The x term is 0.8x. Take half its coefficient (0.4). Square it (0.16) and add it to both sides. Add '0.16' to each side of the equation. 0.8x + 0.16 + x2 = 14.4 + 0.16 Reorder the terms: 0.16 + 0.8x + x2 = 14.4 + 0.16 Combine like terms: 14.4 + 0.16 = 14.56 0.16 + 0.8x + x2 = 14.56 Factor a perfect square on the left side: (x + 0.4)(x + 0.4) = 14.56 Calculate the square root of the right side: 3.815756806 Break this problem into two subproblems by setting (x + 0.4) equal to 3.815756806 and -3.815756806.Subproblem 1
x + 0.4 = 3.815756806 Simplifying x + 0.4 = 3.815756806 Reorder the terms: 0.4 + x = 3.815756806 Solving 0.4 + x = 3.815756806 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 3.815756806 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 3.815756806 + -0.4 x = 3.815756806 + -0.4 Combine like terms: 3.815756806 + -0.4 = 3.415756806 x = 3.415756806 Simplifying x = 3.415756806Subproblem 2
x + 0.4 = -3.815756806 Simplifying x + 0.4 = -3.815756806 Reorder the terms: 0.4 + x = -3.815756806 Solving 0.4 + x = -3.815756806 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -3.815756806 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -3.815756806 + -0.4 x = -3.815756806 + -0.4 Combine like terms: -3.815756806 + -0.4 = -4.215756806 x = -4.215756806 Simplifying x = -4.215756806Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.415756806, -4.215756806}
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