Question

3. If f(x - 1) = 7x-5, find f(x) and f(x + 2)
solve it​

Answer 1

Step-by-step explanation:

f(x-1) = 7x - 5

let f(x) = ax + b(a nad b are any 2 rational numbers)

therefore f(x-1)= a(x-1) + b = ax - a - b

comparing with the given equation we get,

1. ax = 7x => a = 7

2. -a-b = -5

=> a + b = 5

=> b = 5 - a = 5-7 = -2

therefore f(x) = 7x -2

f(x + 2) = 7(x-2) -2 = 7x -14 -2 = 7x -16

Answer 2

answer of f(x-1)=7x-5 is 12/7

answer of f(x+2) is 26/7