7x^2-70=21x

Simple and best practice solution for 7x^2-70=21x 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 7x^2-70=21x equation:


Simplifying
7x2 + -70 = 21x

Reorder the terms:
-70 + 7x2 = 21x

Solving
-70 + 7x2 = 21x

Solving for variable 'x'.

Reorder the terms:
-70 + -21x + 7x2 = 21x + -21x

Combine like terms: 21x + -21x = 0
-70 + -21x + 7x2 = 0

Factor out the Greatest Common Factor (GCF), '7'.
7(-10 + -3x + x2) = 0

Factor a trinomial.
7((-2 + -1x)(5 + -1x)) = 0

Ignore the factor 7.

Subproblem 1

Set the factor '(-2 + -1x)' equal to zero and attempt to solve: Simplifying -2 + -1x = 0 Solving -2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1x = 0 + 2 -1x = 0 + 2 Combine like terms: 0 + 2 = 2 -1x = 2 Divide each side by '-1'. x = -2 Simplifying x = -2

Subproblem 2

Set the factor '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5

Solution

x = {-2, 5}

See similar equations:

| X^4+x^3-4x^2+5x-3=9 | | 19x-(4x-2)=77 | | 4ab+12b=0 | | Xl+2fl=0 | | 3x+-4=4x+-3 | | X-18=x | | x(25-2x)(14-2x)= | | 4(2z+1)-6=62 | | -3(n-8)=3n-15 | | 5x-(-4x+5)=6 | | 4-1=1 | | 60=32-4(x-4) | | 20=3.14*x^2*4 | | 5x+7-3x=8+3x-6 | | 4-3x=2x-11 | | 5x+9x-7x=48+1 | | 5x+100=5 | | Dr=37 | | Nr=15 | | Dr=19 | | Nr=6 | | cosx=0.5x^2 | | 49a^2+28ab^2+4b^2=0 | | 100=x^2+9x^2 | | 100=x+3x | | 2(x-5)-(2x-6)=(x+1)(3x-5) | | Y=x^4-108x+240 | | 25+12x+12x^2+23x^3+34x^4=0 | | x^2+y^2-2x+3y-1=0 | | m-3=45 | | 47X-11y=3 | | q+12=31 |

Equations solver categories