Question

Fill in the blanks.
5) If factor of x²+2x - mx - 18 is
x + 2 then m = ________​

Answer 1

Answer:

let x+2=0

x=-2

let x2+2x-mx-18=0

-2×-2+2×-2-m×-2-18=0

4-4+2m-18=0

2m-18=0

2m=18

m=18/2

m=9