Question

14th question...anyone pls help fast

Answer 1

Answer:

k = 7

Step-by-step explanation:

For real and equal roots, D = 0

=> 4(k-5)^2 -8(k-5) = 0

=> 4k^2 -40k +100 -8k +40 = 0

=> 4k^2 -48K +140 = 0

=> k^2 - 12k + 35 = 0

=> k^2 -5k -7k +35 = 0

=> k(k-5) -7(k-5) = 0

=> k =5 or k =7

but k cannot be 5 as then k-5 = 0 and equation won't be quadratic