Question

If x= 5 is the solution of krº-16x + 5 = 0 find the value of k (Ans : k = 3)​

Answer 1

kx² — 16x + 5 = 0

Seja x = 5

k•5² — 16•5 + 5 = 0

25k — 80 + 5 = 0

25k — 75 = 0

25k = 75

k = 75 ÷ 25

k = 3 (c.q.d)

Espero ter ajudado!