Y= 2x2 - 3x - 20? a) x = -5 and 2 b) x = 5 and -2 c) x = -2.5 and 4 d) x = 2.5 and -4

2x² - 3x - 20

40
2 20
4 10
5 8

2x² - 8x       5x - 20
2x(x - 4)      5(x - 4)
(2x + 5) (x - 4)
2x + 5 = 0      x - 4 = 0
2x = -5          x = 4
x = -5/2
C) x = -2.5 and 4

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct