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Simplifying -5t2 + 15t + 7 = 0 Reorder the terms: 7 + 15t + -5t2 = 0 Solving 7 + 15t + -5t2 = 0 Solving for variable 't'. Begin completing the square. Divide all terms by -5 the coefficient of the squared term: Divide each side by '-5'. -1.4 + -3t + t2 = 0 Move the constant term to the right: Add '1.4' to each side of the equation. -1.4 + -3t + 1.4 + t2 = 0 + 1.4 Reorder the terms: -1.4 + 1.4 + -3t + t2 = 0 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + -3t + t2 = 0 + 1.4 -3t + t2 = 0 + 1.4 Combine like terms: 0 + 1.4 = 1.4 -3t + t2 = 1.4 The t term is -3t. Take half its coefficient (-1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. -3t + 2.25 + t2 = 1.4 + 2.25 Reorder the terms: 2.25 + -3t + t2 = 1.4 + 2.25 Combine like terms: 1.4 + 2.25 = 3.65 2.25 + -3t + t2 = 3.65 Factor a perfect square on the left side: (t + -1.5)(t + -1.5) = 3.65 Calculate the square root of the right side: 1.910497317 Break this problem into two subproblems by setting (t + -1.5) equal to 1.910497317 and -1.910497317.Subproblem 1
t + -1.5 = 1.910497317 Simplifying t + -1.5 = 1.910497317 Reorder the terms: -1.5 + t = 1.910497317 Solving -1.5 + t = 1.910497317 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + t = 1.910497317 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + t = 1.910497317 + 1.5 t = 1.910497317 + 1.5 Combine like terms: 1.910497317 + 1.5 = 3.410497317 t = 3.410497317 Simplifying t = 3.410497317Subproblem 2
t + -1.5 = -1.910497317 Simplifying t + -1.5 = -1.910497317 Reorder the terms: -1.5 + t = -1.910497317 Solving -1.5 + t = -1.910497317 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + t = -1.910497317 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + t = -1.910497317 + 1.5 t = -1.910497317 + 1.5 Combine like terms: -1.910497317 + 1.5 = -0.410497317 t = -0.410497317 Simplifying t = -0.410497317Solution
The solution to the problem is based on the solutions from the subproblems. t = {3.410497317, -0.410497317}
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