Question

1/a is the root of the equation 2x²-5x+7=0, then the value of 7a²-5a​

Answer 1

Answer:

2(1/a)-5(1/a)+7=0

2/a - 5/a = -7

2-5/a = -7

-3/a = -7

(3/7 = a)

now put value of a

7(3/7)^2- 5(3/7)

63/49 - 15 / 7

63 - 105 /7

-42/7

( -6)