If it's not what You are looking for type in the equation solver your own equation and let us solve it.
Simplifying 0 = x * x + -8x + 21 Multiply x * x 0 = x2 + -8x + 21 Reorder the terms: 0 = 21 + -8x + x2 Solving 0 = 21 + -8x + x2 Solving for variable 'x'. Combine like terms: 0 + -21 = -21 -21 + 8x + -1x2 = 21 + -8x + x2 + -21 + 8x + -1x2 Reorder the terms: -21 + 8x + -1x2 = 21 + -21 + -8x + 8x + x2 + -1x2 Combine like terms: 21 + -21 = 0 -21 + 8x + -1x2 = 0 + -8x + 8x + x2 + -1x2 -21 + 8x + -1x2 = -8x + 8x + x2 + -1x2 Combine like terms: -8x + 8x = 0 -21 + 8x + -1x2 = 0 + x2 + -1x2 -21 + 8x + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -21 + 8x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. 21 + -8x + x2 = 0 Move the constant term to the right: Add '-21' to each side of the equation. 21 + -8x + -21 + x2 = 0 + -21 Reorder the terms: 21 + -21 + -8x + x2 = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -8x + x2 = 0 + -21 -8x + x2 = 0 + -21 Combine like terms: 0 + -21 = -21 -8x + x2 = -21 The x term is -8x. Take half its coefficient (-4). Square it (16) and add it to both sides. Add '16' to each side of the equation. -8x + 16 + x2 = -21 + 16 Reorder the terms: 16 + -8x + x2 = -21 + 16 Combine like terms: -21 + 16 = -5 16 + -8x + x2 = -5 Factor a perfect square on the left side: (x + -4)(x + -4) = -5 Can't calculate square root of the right side. The solution to this equation could not be determined.
| 3-315=26 | | -6v+4(v+2)=2 | | 315=26-3 | | 4x-13=57 | | 315=26 | | 6y+2x=15 | | 2x+0.1=5.25 | | 280+25n=660 | | x+0.1x=5.25 | | 3k-14k+25=2-6k-12 | | 7x-8=4x-10 | | 6(x-2)=3x+10 | | 2+g+g=14 | | K^2-2kx-k=0 | | 3x+19=10x-37 | | -5z-6=-8z-9 | | 12.75+1.25r=22.75 | | 4x^2+62x-32=0 | | 3x+y=3z | | 2x+12=3x+18 | | z^3+729=0 | | 140+5.5h=195 | | 4(x-6)-5x=-3 | | 2(h-8)-h=h-6 | | x^2+9x-4=0 | | 324x^2+36x+1=0 | | 15-x=6 | | y=3+5 | | 9y+18=90 | | K(x)=x^2+10x-200 | | 11x+2=90 | | 3x=-36 |