Question

check whether 5/2 is the zero of the polynomial 4x2-8kx+9 and also find the value of k


haa xD

ya sure (◕ᴗ◕✿)​

Answer 1

Answer:

4x²-8kx+9 = 0

put x = 5/2

4(5/2)²-8k(5/2)+9 = 0

4(25/4) - 8k(5/2) + 9 = 0

100/4 - 40k/2 + 9 = 0

25 - 20k + 9 = 0

34 - 20k = 0

20k = 34

k = 34/20

k = 17/10