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Simplifying 0.05s2 + 1.1s + -78 = 0 Reorder the terms: -78 + 1.1s + 0.05s2 = 0 Solving -78 + 1.1s + 0.05s2 = 0 Solving for variable 's'. Begin completing the square. Divide all terms by 0.05 the coefficient of the squared term: Divide each side by '0.05'. -1560 + 22s + s2 = 0 Move the constant term to the right: Add '1560' to each side of the equation. -1560 + 22s + 1560 + s2 = 0 + 1560 Reorder the terms: -1560 + 1560 + 22s + s2 = 0 + 1560 Combine like terms: -1560 + 1560 = 0 0 + 22s + s2 = 0 + 1560 22s + s2 = 0 + 1560 Combine like terms: 0 + 1560 = 1560 22s + s2 = 1560 The s term is 22s. Take half its coefficient (11). Square it (121) and add it to both sides. Add '121' to each side of the equation. 22s + 121 + s2 = 1560 + 121 Reorder the terms: 121 + 22s + s2 = 1560 + 121 Combine like terms: 1560 + 121 = 1681 121 + 22s + s2 = 1681 Factor a perfect square on the left side: (s + 11)(s + 11) = 1681 Calculate the square root of the right side: 41 Break this problem into two subproblems by setting (s + 11) equal to 41 and -41.Subproblem 1
s + 11 = 41 Simplifying s + 11 = 41 Reorder the terms: 11 + s = 41 Solving 11 + s = 41 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + s = 41 + -11 Combine like terms: 11 + -11 = 0 0 + s = 41 + -11 s = 41 + -11 Combine like terms: 41 + -11 = 30 s = 30 Simplifying s = 30Subproblem 2
s + 11 = -41 Simplifying s + 11 = -41 Reorder the terms: 11 + s = -41 Solving 11 + s = -41 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + s = -41 + -11 Combine like terms: 11 + -11 = 0 0 + s = -41 + -11 s = -41 + -11 Combine like terms: -41 + -11 = -52 s = -52 Simplifying s = -52Solution
The solution to the problem is based on the solutions from the subproblems. s = {30, -52}
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