Find all the zeroes of the equation. -3x^4 + 27x^2 + 1200 = 0i just want more of an explanation on how to get it .

replace x^2 with m and try to solve

-3 m^2 +27 m +1200 =0

factor out -3

-3(m^2 -9m-400)=0

-3 (m-25) (m+16) =0

using the zero product property

m-25 =0 m+16=0

m=25  m=-16

then substitute m=x^2 back in

x^2 = 25   x^2 = -16

x take the square root of each side

x = +- sqrt (25)   if you know complex number  x = +- sqrt (-16)

x = +-5      x = +- 4i

 +5, -5 , +4i, -4i

answer: she must produce at least 9,000 windows in order to make a profit of $48,000

explanation:

48,000 - 12,000 = 36,000

36,000/4 = 9,000

80%

step-by-step explanation: