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Simplifying 20 = -16t2 + 40t + 5 Reorder the terms: 20 = 5 + 40t + -16t2 Solving 20 = 5 + 40t + -16t2 Solving for variable 't'. Combine like terms: 20 + -5 = 15 15 + -40t + 16t2 = 5 + 40t + -16t2 + -5 + -40t + 16t2 Reorder the terms: 15 + -40t + 16t2 = 5 + -5 + 40t + -40t + -16t2 + 16t2 Combine like terms: 5 + -5 = 0 15 + -40t + 16t2 = 0 + 40t + -40t + -16t2 + 16t2 15 + -40t + 16t2 = 40t + -40t + -16t2 + 16t2 Combine like terms: 40t + -40t = 0 15 + -40t + 16t2 = 0 + -16t2 + 16t2 15 + -40t + 16t2 = -16t2 + 16t2 Combine like terms: -16t2 + 16t2 = 0 15 + -40t + 16t2 = 0 Begin completing the square. Divide all terms by 16 the coefficient of the squared term: Divide each side by '16'. 0.9375 + -2.5t + t2 = 0 Move the constant term to the right: Add '-0.9375' to each side of the equation. 0.9375 + -2.5t + -0.9375 + t2 = 0 + -0.9375 Reorder the terms: 0.9375 + -0.9375 + -2.5t + t2 = 0 + -0.9375 Combine like terms: 0.9375 + -0.9375 = 0.0000 0.0000 + -2.5t + t2 = 0 + -0.9375 -2.5t + t2 = 0 + -0.9375 Combine like terms: 0 + -0.9375 = -0.9375 -2.5t + t2 = -0.9375 The t term is -2.5t. Take half its coefficient (-1.25). Square it (1.5625) and add it to both sides. Add '1.5625' to each side of the equation. -2.5t + 1.5625 + t2 = -0.9375 + 1.5625 Reorder the terms: 1.5625 + -2.5t + t2 = -0.9375 + 1.5625 Combine like terms: -0.9375 + 1.5625 = 0.625 1.5625 + -2.5t + t2 = 0.625 Factor a perfect square on the left side: (t + -1.25)(t + -1.25) = 0.625 Calculate the square root of the right side: 0.790569415 Break this problem into two subproblems by setting (t + -1.25) equal to 0.790569415 and -0.790569415.Subproblem 1
t + -1.25 = 0.790569415 Simplifying t + -1.25 = 0.790569415 Reorder the terms: -1.25 + t = 0.790569415 Solving -1.25 + t = 0.790569415 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + t = 0.790569415 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + t = 0.790569415 + 1.25 t = 0.790569415 + 1.25 Combine like terms: 0.790569415 + 1.25 = 2.040569415 t = 2.040569415 Simplifying t = 2.040569415Subproblem 2
t + -1.25 = -0.790569415 Simplifying t + -1.25 = -0.790569415 Reorder the terms: -1.25 + t = -0.790569415 Solving -1.25 + t = -0.790569415 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + t = -0.790569415 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + t = -0.790569415 + 1.25 t = -0.790569415 + 1.25 Combine like terms: -0.790569415 + 1.25 = 0.459430585 t = 0.459430585 Simplifying t = 0.459430585Solution
The solution to the problem is based on the solutions from the subproblems. t = {2.040569415, 0.459430585}
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