Question 860163
How do you solve these four problems im really lost 
3V^2+9V-54=0
Divide by 3, make it easier
v^2 + 3v - 18 = 0
Factor it
(v+6)*(v-3) = 0
Product = 0 --> 1 of the factors is zero
v+6 = 0
v = -6
---
v-3 = 0
v = +3
========================
6X^2-2x-4=0
Similar to #1
========================
2X^2-7x-12=0
Can't be factored, use the quadratic equation
*[invoke solve_quadratic_equation 2,-7,-12]
The solver always says it can be factored, ignore that.

========================
11K^2+8k+9=0
*[invoke solve_quadratic_equation 11,8,9]