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Simplifying 25t2 + -20t + -16 = 0 Reorder the terms: -16 + -20t + 25t2 = 0 Solving -16 + -20t + 25t2 = 0 Solving for variable 't'. Begin completing the square. Divide all terms by 25 the coefficient of the squared term: Divide each side by '25'. -0.64 + -0.8t + t2 = 0 Move the constant term to the right: Add '0.64' to each side of the equation. -0.64 + -0.8t + 0.64 + t2 = 0 + 0.64 Reorder the terms: -0.64 + 0.64 + -0.8t + t2 = 0 + 0.64 Combine like terms: -0.64 + 0.64 = 0.00 0.00 + -0.8t + t2 = 0 + 0.64 -0.8t + t2 = 0 + 0.64 Combine like terms: 0 + 0.64 = 0.64 -0.8t + t2 = 0.64 The t term is -0.8t. 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. -0.8t + 0.16 + t2 = 0.64 + 0.16 Reorder the terms: 0.16 + -0.8t + t2 = 0.64 + 0.16 Combine like terms: 0.64 + 0.16 = 0.8 0.16 + -0.8t + t2 = 0.8 Factor a perfect square on the left side: (t + -0.4)(t + -0.4) = 0.8 Calculate the square root of the right side: 0.894427191 Break this problem into two subproblems by setting (t + -0.4) equal to 0.894427191 and -0.894427191.Subproblem 1
t + -0.4 = 0.894427191 Simplifying t + -0.4 = 0.894427191 Reorder the terms: -0.4 + t = 0.894427191 Solving -0.4 + t = 0.894427191 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + t = 0.894427191 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + t = 0.894427191 + 0.4 t = 0.894427191 + 0.4 Combine like terms: 0.894427191 + 0.4 = 1.294427191 t = 1.294427191 Simplifying t = 1.294427191Subproblem 2
t + -0.4 = -0.894427191 Simplifying t + -0.4 = -0.894427191 Reorder the terms: -0.4 + t = -0.894427191 Solving -0.4 + t = -0.894427191 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + t = -0.894427191 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + t = -0.894427191 + 0.4 t = -0.894427191 + 0.4 Combine like terms: -0.894427191 + 0.4 = -0.494427191 t = -0.494427191 Simplifying t = -0.494427191Solution
The solution to the problem is based on the solutions from the subproblems. t = {1.294427191, -0.494427191}
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