Question

6.
Find the values of K for the ginner quadratic equation 2x + kn + 3. so that
they have two equal root.
Determine the AP whose 3rd termies and the 7th term is 9​

Answer 1

Step-by-step explanation:

Let the speed of the steamer in still water be x km/h.

Then, the speed downstream =(x+2) km/h

and the speed upstream =(x−2) km/h

Given, distance covered in 4 hours downstream = distance covered in 5 hours upstream

∴4(x+2)=5(x−2)

⇒4x+8=5x−10

⟹4x−5x=−10−8

[Transposing 5x to LHS and 8 to RHS]

⟹−x=−18 or x=18km/h