Question

Could someone please help me with these two questions??

Answer 1

#3.
x^2 - 18x - 19 = 0
19 is prime, only has two factors
The sum of factors must add to equal middle term -18

( x - 19)(x + 1) = 0
answer x = -1, 19

#4.
-81 factors must add to equal middle term 0

(x+9)(x-9) = 0
answer x = 9, -9