The equation - 5x² + 72x + 378 models the number of students enrolled in a school where x is the number of years since the school first opened in 1990. Which equation can be used to find the year in which 502 students were enrolled?
a - 5x² + 72x - 124 = 0
b - 5x² + 72x + 502 = 0
c - 5x² + 72x - 502 = 0
d - 5x² + 72x + 124 = 0

Question

The equation - 5x² + 72x + 378  models the number of students enrolled in a school where x is the number of years since the school first opened in 1990.  Which equation can be used to find the year in which 502 students were enrolled?
a - 5x² + 72x - 124 = 0
b - 5x² + 72x + 502 = 0
c - 5x² + 72x - 502 = 0
d - 5x² + 72x + 124 = 0

crashonce · Answer

I'm pretty sure you just solve the equation -5x^2 +72x+378=502
Which is -5x^2 + 72x -124.
A

crashonce · Answer

SO just put 502 where zero should have been sorry if i revealed the answer

anonymous · Answer

Okay! Thank you very much!

crashonce · Answer

np