Question

Please Help:
If f(x - 1) = 2x + 3 for all values of x, what is the value of f(-3) ?

Answer 1

@zepdrix

Answer 2

@welshfella

Answer 3

let f(x - 1) = a(x -1) + b = ax - a + b
compare this with 2x + 3:-
ax = 2x so a = 2
and -a + b = -2 + b = 3 so B = 3+2 = 5

so f(x) = 2x + 5

Answer 4

now plug in x = -3 to find f)-3)

Answer 5

* f(-3)

Answer 6

i see so you have to find f(x) before f(-3)

Answer 7

yeaea

Answer 8

soo 2(-3) +5 = -1

Answer 9

right

Answer 10

thanks

Answer 11

also there is another question that is bothering me

Answer 12

ok
but plz re post

Answer 13

k