a^2+7a-9=9

Simple and best practice solution for a^2+7a-9=9 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 a^2+7a-9=9 equation:


Simplifying
a2 + 7a + -9 = 9

Reorder the terms:
-9 + 7a + a2 = 9

Solving
-9 + 7a + a2 = 9

Solving for variable 'a'.

Reorder the terms:
-9 + -9 + 7a + a2 = 9 + -9

Combine like terms: -9 + -9 = -18
-18 + 7a + a2 = 9 + -9

Combine like terms: 9 + -9 = 0
-18 + 7a + a2 = 0

Factor a trinomial.
(-9 + -1a)(2 + -1a) = 0

Subproblem 1

Set the factor '(-9 + -1a)' equal to zero and attempt to solve: Simplifying -9 + -1a = 0 Solving -9 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1a = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1a = 0 + 9 -1a = 0 + 9 Combine like terms: 0 + 9 = 9 -1a = 9 Divide each side by '-1'. a = -9 Simplifying a = -9

Subproblem 2

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

Solution

a = {-9, 2}

See similar equations:

| 7-2a=43 | | 2(f-14)=-8 | | 5x/8-3/10=7x/40 | | e*x=4 | | 4(n-12)=16 | | 12-10a=-28 | | 12=3(w-15) | | 4-5a=16 | | -6=-(w-2) | | 6y+8=48 | | C(t)=2t+1 | | 7=-16t^2+40+c | | -3(k-7)+10=4 | | 2=2(c-4)-2 | | 2(r+7)+-1=-7 | | 10x+7=180 | | 7p+2=5+6p | | 2(f-13)-6=8 | | 5x+2=5x+5 | | 2=4(v-14)-14 | | 2=4(v-14)14 | | 1x+1=1x | | 63*2/9 | | -6x^2=11x-10 | | -2(z+3)=-2 | | 7x5/11 | | 14x+1=180 | | -2(y-18)=-4 | | -4(z-19)=16 | | 4z=17 | | 52/4=m/5 | | 1/5z=-9 |

Equations solver categories