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Simplifying 5x2 + -9x + -36 = 0 Reorder the terms: -36 + -9x + 5x2 = 0 Solving -36 + -9x + 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'. -7.2 + -1.8x + x2 = 0 Move the constant term to the right: Add '7.2' to each side of the equation. -7.2 + -1.8x + 7.2 + x2 = 0 + 7.2 Reorder the terms: -7.2 + 7.2 + -1.8x + x2 = 0 + 7.2 Combine like terms: -7.2 + 7.2 = 0.0 0.0 + -1.8x + x2 = 0 + 7.2 -1.8x + x2 = 0 + 7.2 Combine like terms: 0 + 7.2 = 7.2 -1.8x + x2 = 7.2 The x term is -1.8x. Take half its coefficient (-0.9). Square it (0.81) and add it to both sides. Add '0.81' to each side of the equation. -1.8x + 0.81 + x2 = 7.2 + 0.81 Reorder the terms: 0.81 + -1.8x + x2 = 7.2 + 0.81 Combine like terms: 7.2 + 0.81 = 8.01 0.81 + -1.8x + x2 = 8.01 Factor a perfect square on the left side: (x + -0.9)(x + -0.9) = 8.01 Calculate the square root of the right side: 2.83019434 Break this problem into two subproblems by setting (x + -0.9) equal to 2.83019434 and -2.83019434.Subproblem 1
x + -0.9 = 2.83019434 Simplifying x + -0.9 = 2.83019434 Reorder the terms: -0.9 + x = 2.83019434 Solving -0.9 + x = 2.83019434 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = 2.83019434 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = 2.83019434 + 0.9 x = 2.83019434 + 0.9 Combine like terms: 2.83019434 + 0.9 = 3.73019434 x = 3.73019434 Simplifying x = 3.73019434Subproblem 2
x + -0.9 = -2.83019434 Simplifying x + -0.9 = -2.83019434 Reorder the terms: -0.9 + x = -2.83019434 Solving -0.9 + x = -2.83019434 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = -2.83019434 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = -2.83019434 + 0.9 x = -2.83019434 + 0.9 Combine like terms: -2.83019434 + 0.9 = -1.93019434 x = -1.93019434 Simplifying x = -1.93019434Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.73019434, -1.93019434}
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