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Simplifying 7x2 + -19x + 9 + -1 = 0 Reorder the terms: 9 + -1 + -19x + 7x2 = 0 Combine like terms: 9 + -1 = 8 8 + -19x + 7x2 = 0 Solving 8 + -19x + 7x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 7 the coefficient of the squared term: Divide each side by '7'. 1.142857143 + -2.714285714x + x2 = 0 Move the constant term to the right: Add '-1.142857143' to each side of the equation. 1.142857143 + -2.714285714x + -1.142857143 + x2 = 0 + -1.142857143 Reorder the terms: 1.142857143 + -1.142857143 + -2.714285714x + x2 = 0 + -1.142857143 Combine like terms: 1.142857143 + -1.142857143 = 0.000000000 0.000000000 + -2.714285714x + x2 = 0 + -1.142857143 -2.714285714x + x2 = 0 + -1.142857143 Combine like terms: 0 + -1.142857143 = -1.142857143 -2.714285714x + x2 = -1.142857143 The x term is -2.714285714x. Take half its coefficient (-1.357142857). Square it (1.841836734) and add it to both sides. Add '1.841836734' to each side of the equation. -2.714285714x + 1.841836734 + x2 = -1.142857143 + 1.841836734 Reorder the terms: 1.841836734 + -2.714285714x + x2 = -1.142857143 + 1.841836734 Combine like terms: -1.142857143 + 1.841836734 = 0.698979591 1.841836734 + -2.714285714x + x2 = 0.698979591 Factor a perfect square on the left side: (x + -1.357142857)(x + -1.357142857) = 0.698979591 Calculate the square root of the right side: 0.836049993 Break this problem into two subproblems by setting (x + -1.357142857) equal to 0.836049993 and -0.836049993.Subproblem 1
x + -1.357142857 = 0.836049993 Simplifying x + -1.357142857 = 0.836049993 Reorder the terms: -1.357142857 + x = 0.836049993 Solving -1.357142857 + x = 0.836049993 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.357142857' to each side of the equation. -1.357142857 + 1.357142857 + x = 0.836049993 + 1.357142857 Combine like terms: -1.357142857 + 1.357142857 = 0.000000000 0.000000000 + x = 0.836049993 + 1.357142857 x = 0.836049993 + 1.357142857 Combine like terms: 0.836049993 + 1.357142857 = 2.19319285 x = 2.19319285 Simplifying x = 2.19319285Subproblem 2
x + -1.357142857 = -0.836049993 Simplifying x + -1.357142857 = -0.836049993 Reorder the terms: -1.357142857 + x = -0.836049993 Solving -1.357142857 + x = -0.836049993 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.357142857' to each side of the equation. -1.357142857 + 1.357142857 + x = -0.836049993 + 1.357142857 Combine like terms: -1.357142857 + 1.357142857 = 0.000000000 0.000000000 + x = -0.836049993 + 1.357142857 x = -0.836049993 + 1.357142857 Combine like terms: -0.836049993 + 1.357142857 = 0.521092864 x = 0.521092864 Simplifying x = 0.521092864Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.19319285, 0.521092864}
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