Question

verify whether x = -1 and x = -4 are zeroes of polynomial p(x) = x2 - 3x - 4

Answer 1

p(x)=2(-1) - 3(-1)-4
-2+3-4
-6+3
-3
p(x)=2(-4) - 3 (-4) -4
-8 +12 -4
-12 +12
0
(x+4) is the Factor of the polynomial x2 - 3x - 4

Answer 2

p (-1) = (-1)2 - 3 (-1) - 4
= -2 - (-3) - 4
= -2 + 3 - 4
= -6 + 3
= -3
p is not equal to 0

p (-4) = (-4) 2 - 3 (-4) - 4
= -8 - (-12) -4
= -12 +12
= 0
therefore p = 0