If it's not what You are looking for type in the equation solver your own equation and let us solve it.
Simplifying
4x2 + -9 = 21
Reorder the terms:
-9 + 4x2 = 21
Solving
-9 + 4x2 = 21
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '9' to each side of the equation.
-9 + 9 + 4x2 = 21 + 9
Combine like terms: -9 + 9 = 0
0 + 4x2 = 21 + 9
4x2 = 21 + 9
Combine like terms: 21 + 9 = 30
4x2 = 30
Divide each side by '4'.
x2 = 7.5
Simplifying
x2 = 7.5
Take the square root of each side:
x = {-2.738612788, 2.738612788}
| 2-y=1-7x | | 0=x^2+6x-247 | | 25x+6=6+25x | | -3f=-6 | | 3(c-3)=2(c-1) | | -3(x-9)+4=-10 | | 38-2x=15x+4 | | 7x+3-3x=1+3x-10 | | 2x+2=15x+4 | | .0795x^2-.902x+1.834=0 | | 37-2(x+8)=4 | | .75x+.33y=.4x+y | | 2x^2-23x+63= | | z^2+4z-21=0 | | 5x+2+-9=40 | | 2m-7m+8m=15 | | x^2+6-27=0 | | 9+4x=2-1 | | 5e-35=9e+9 | | 16-5(x-4)=46 | | 12e+49=6e+31 | | -9x-2=14x | | -2x+8=6-(7x+4) | | n+3n+8=8 | | -9x+1=14x | | -9-2x=14x | | x^3-50=75 | | 3g-5=4 | | 0.3x-1.1=0.3 | | 2(x+4)+10=4(x-5)+28 | | 5+2k=9 | | x-7y+5z=-36 |