If it's not what You are looking for type in the equation solver your own equation and let us solve it.
Simplifying -5x2 + -21x + 4 = 0 Reorder the terms: 4 + -21x + -5x2 = 0 Solving 4 + -21x + -5x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -5 the coefficient of the squared term: Divide each side by '-5'. -0.8 + 4.2x + x2 = 0 Move the constant term to the right: Add '0.8' to each side of the equation. -0.8 + 4.2x + 0.8 + x2 = 0 + 0.8 Reorder the terms: -0.8 + 0.8 + 4.2x + x2 = 0 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + 4.2x + x2 = 0 + 0.8 4.2x + x2 = 0 + 0.8 Combine like terms: 0 + 0.8 = 0.8 4.2x + x2 = 0.8 The x term is 4.2x. Take half its coefficient (2.1). Square it (4.41) and add it to both sides. Add '4.41' to each side of the equation. 4.2x + 4.41 + x2 = 0.8 + 4.41 Reorder the terms: 4.41 + 4.2x + x2 = 0.8 + 4.41 Combine like terms: 0.8 + 4.41 = 5.21 4.41 + 4.2x + x2 = 5.21 Factor a perfect square on the left side: (x + 2.1)(x + 2.1) = 5.21 Calculate the square root of the right side: 2.282542442 Break this problem into two subproblems by setting (x + 2.1) equal to 2.282542442 and -2.282542442.Subproblem 1
x + 2.1 = 2.282542442 Simplifying x + 2.1 = 2.282542442 Reorder the terms: 2.1 + x = 2.282542442 Solving 2.1 + x = 2.282542442 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.1' to each side of the equation. 2.1 + -2.1 + x = 2.282542442 + -2.1 Combine like terms: 2.1 + -2.1 = 0.0 0.0 + x = 2.282542442 + -2.1 x = 2.282542442 + -2.1 Combine like terms: 2.282542442 + -2.1 = 0.182542442 x = 0.182542442 Simplifying x = 0.182542442Subproblem 2
x + 2.1 = -2.282542442 Simplifying x + 2.1 = -2.282542442 Reorder the terms: 2.1 + x = -2.282542442 Solving 2.1 + x = -2.282542442 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.1' to each side of the equation. 2.1 + -2.1 + x = -2.282542442 + -2.1 Combine like terms: 2.1 + -2.1 = 0.0 0.0 + x = -2.282542442 + -2.1 x = -2.282542442 + -2.1 Combine like terms: -2.282542442 + -2.1 = -4.382542442 x = -4.382542442 Simplifying x = -4.382542442Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.182542442, -4.382542442}
| 1b+2=3 | | H+21=28 | | -3+7(n+7)=53 | | -5x^2-21x-4=0 | | -7x+5-x=-19 | | 1.25=.75+r | | 7n+15=36 | | Z+-79=15 | | ex+3=20 | | n/4-9=12 | | f(-2)=3x^2-8x+7 | | -(-5-6*-1/2)=4(5*-1/2)+3 | | 4v+7=11 | | 12x^2+x-7=0 | | -(-5-6*1/2)=4(5*1/2)+3 | | -7(x+7)-5=-103 | | 0.5m+2=-10 | | -(-5-6*2)=4(5*2)+3 | | 0.2x+2(1.7x+3)-5=1.9 | | 4d-(12d-3)=43 | | 1+2a=17 | | Z-7.2=-12.8 | | 6+-7=-10 | | -(-5-6*-2)=4(5*-2)+3 | | -6n+7=13 | | 2x+4y=680 | | 242+10x-2+7x+1=360 | | 15n+2=2 | | 4y-16=2x | | -69+x=43-7x | | -11=u+79 | | ln*3+ln*x=12 |