Question

px square + 3x +q=0 has the x= -1and x=-2 find p-q

Answer 1

px^2+3x+q=0
when x=-1
p(-1)^2+3(-1)+q=0
p+q=3

when x=-2
p(-2)^2+3(-2)+q=0
4p-6+q=0
4p+q=6

By eliminating,
p=1 & q=2
p-q=-1
When you're asked q-p
it's equal to 1.