17. x=360-320 x=40
18. x=360-275 x=85
19. x=360-290 x=70
20. x=360-260 x=100
Answer:
9x^2 -4
Step-by-step explanation:
(3x+2) (3x-2)
FOIL
first: 3x*3x = 9x^2
outer: 3x*-2 = -6x
inner: 3x*2 = 6x
last: -2*2 = -4
Add together
9x^2 -6x+6x -4