-4+4a^2=21

Simple and best practice solution for -4+4a^2=21 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for -4+4a^2=21 equation: 


Simplifying
-4 + 4a2 = 21

Solving
-4 + 4a2 = 21

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '4' to each side of the equation.
-4 + 4 + 4a2 = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 4a2 = 21 + 4
4a2 = 21 + 4

Combine like terms: 21 + 4 = 25
4a2 = 25

Divide each side by '4'.
a2 = 6.25

Simplifying
a2 = 6.25

Take the square root of each side:
a = {-2.5, 2.5}

See similar equations:

| K/9=55 | | z^2+2z+(1-i)=o | | 10w=3.4 | | 3/4k-5=-2-x | | 0.19*x=11.4 | | 1/5x-1/2=4 | | 3(3/8)-4 | | x-(x^(1/2))=42 | | 3x^2y-6xy^2=0 | | 2m+6=28 | | 19*x=11.4 | | 6x=213 | | 4n+5=4.75 | | 14.43+0.13x=15.18+0.07x | | x-x^1/2=42 | | 4n+5=4.7 | | 16x^2+36x-10=0 | | 3x-5=-59 | | 18k=-5(-4k-15)-17k | | 10+x-1.333x=0 | | 4x^2+12x-4= | | 100-35=65 | | 5.5x+37=57 | | 2(3b-1)=30 | | 6x-(x-8)=0 | | -6=-11+5x | | 20-7(5y-19)=-15-18y-19 | | a/5=45/13 | | 1/2(x-8)=1 | | 3x+2(2x+8)=-12 | | x=45-5y^2 | | 3(-3r-2)=-10r |

Equations solver categories