If it's not what You are looking for type in the equation solver your own equation and let us solve it.
Simplifying
3x2 + -21 = 126
Reorder the terms:
-21 + 3x2 = 126
Solving
-21 + 3x2 = 126
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '21' to each side of the equation.
-21 + 21 + 3x2 = 126 + 21
Combine like terms: -21 + 21 = 0
0 + 3x2 = 126 + 21
3x2 = 126 + 21
Combine like terms: 126 + 21 = 147
3x2 = 147
Divide each side by '3'.
x2 = 49
Simplifying
x2 = 49
Take the square root of each side:
x = {-7, 7}
| 5w+4=32 | | 2f-5=3f-12 | | 3x+5y=139 | | q=3fx(2d/3g) | | X^2+2x+13=y^2 | | (2x+5)=10 | | 8(x)+y=150+2(x) | | sinx=0.35514 | | 40-3c=17 | | a=c/2b | | 2cosine(x+20)=1 | | 2cos(x+20)=1 | | (x+1)+(x+2)+(x+3)+(x+4)+(x+5)=30 | | 2(3m-4)=3m-8 | | f(x)=-16x^2+32x+20 | | 2h-4/-2=-3 | | x^2-4*x=0 | | 5x-3/4=2x1/4 | | 10-2(4-3x)=-4 | | 2011-78= | | 4x+4-4x-8=192 | | 2x+4-2x=24 | | 4040+3225+2000+x=2x | | 0+2000+x=2.9x | | x^2-12x+22=-14 | | 2(4x-3)+4=5+-6 | | 2x+2-2x=24 | | 3x(2x-9)+6x=-19 | | .60x=360 | | x^6+21x-22=0 | | x^6+21x+22=0 | | %0f18 |