Question

Can someone explain how to solve this type of ecuations ? (not the answer just how to do it )


Let f(x) = x2 - 8x + 5. Find f(-1).

Answer 1

simply put (-1) in place of x in the given equation

Answer 2

f(-1)=(-1)^2-8(-1)+5
=1+8+5
=14

Answer 3

so i just have to replace and solve ?

Answer 4

yup..

Answer 5

and what happens if the ecuation is like this ....

Let f(x) = x + 8 and g(x) = x2 - 6x - 7. Find f(g(2)).

Answer 6

@nirmalnema

Answer 7

first replace the x by 2 in the eq of g(x)=4-(6)(2)-7=-15
now the the value of g(x) in the function f(x)
f(g(-15))=-15+8
=-7