Question

one zeros of the quadratic polynomial 2x²-8x-m is 5/2 find m and other zeros

Answer 1

this is how you do this problem

Answer 2

p(5/2)=2(25/4)-8(5/2)-m
0=25/2-20-m
m=-7.5
2x^2-8x+7.5
2x^2-3x-5x+7.5=0
x(2x-3)-2.5(2x-3)=0
(x-5/2)(2x-3)=0
the other zero is 3/2