Answer:
comment the question I will try to solve it.....
1.50x + 450 = 3x
450 = 3x - 1.50x
450 = 1.50x
450/1.50 = x
300 = x
300 copies must be sold to break even
Answer:
y=x+20
Step-by-step explanation:
we have to find the slope
y2-y1/x2-x1
3-2/23-22
1/1
y=1x+b
y-22 = 1(x-2) + b
y=x+20
First simplify the expression into polynomial form,
![(x-1)(x-3)(x+5)(x+7)=297](https://tex.z-dn.net/?f=%28x-1%29%28x-3%29%28x%2B5%29%28x%2B7%29%3D297)
![x^4+8x^3-10x^2-104x+105=297](https://tex.z-dn.net/?f=x%5E4%2B8x%5E3-10x%5E2-104x%2B105%3D297)
![x^4+8x^3-10x^2-104x-192=0](https://tex.z-dn.net/?f=x%5E4%2B8x%5E3-10x%5E2-104x-192%3D0)
Now factor into,
![(x-4)(x+8)(x^2+4x+6)=0](https://tex.z-dn.net/?f=%28x-4%29%28x%2B8%29%28x%5E2%2B4x%2B6%29%3D0)
Which means the solutions are,
![x-4=0\implies\boxed{x_1=4}](https://tex.z-dn.net/?f=x-4%3D0%5Cimplies%5Cboxed%7Bx_1%3D4%7D)
![x+8=0\implies\boxed{x_2=-8}](https://tex.z-dn.net/?f=x%2B8%3D0%5Cimplies%5Cboxed%7Bx_2%3D-8%7D)
and then two complex solutions because determinant of the third factor
,
![x^2+4x+6=0](https://tex.z-dn.net/?f=x%5E2%2B4x%2B6%3D0)
![x^2+4x+4=-2](https://tex.z-dn.net/?f=x%5E2%2B4x%2B4%3D-2)
![(x+2)^2=-2\implies\boxed{x_3=i\sqrt{2}-2},\boxed{x_4=-i\sqrt{2}-2}](https://tex.z-dn.net/?f=%28x%2B2%29%5E2%3D-2%5Cimplies%5Cboxed%7Bx_3%3Di%5Csqrt%7B2%7D-2%7D%2C%5Cboxed%7Bx_4%3D-i%5Csqrt%7B2%7D-2%7D)
Hope this helps :)
Answer:
2
−
9
x
Step-by-step explanation: