Answer:
Explanation:
First you want to move everything to one side:
9n^2 - 7n - 4 = 0
The quadratic formula is (-b +- sqrt(a^2 - 4ac)) / 2a
In the above equation, 9 is a, -7 is b, and -4 is c
Plug those into the quadratic formula
(-(-7) +- sqrt(9^2 - 4(9)(-4))) / 2(9)
7+sqrt(81 + 144) / 18
7 + sqrt (225) / 18
7+ 15 / 18
22 / 18 or 11/9