Question

If f(X+4) =3x+2 ,then find the value of f(4) please explain our answer in a clear way​

Answer 1

Answer: 2

hi,

Explanation:

`f(x+4)=3x+2\\\\Let\ say\ y=x+4\ or\ x=y-4\\\\f(y)=3*(y-4)+2=3y-12+2=3y-10\\\\so\ f(x)=3x-10\\\\and\ f(4)=3*4-10=12-10=2\\`

Answer 2

`\\ \sf\longmapsto f(x+4)=3x+2`

• Taking y=x+4
• so x=y-4

`\\ \sf\longmapsto f(y)=3(y-4)+2`

`\\ \sf\longmapsto f(y)=3y-12+2`

`\\ \sf\longmapsto f(y)=3y-10`

Hence

`\\ \sf\longmapsto f(x)=3x-10`

So

`\\ \sf\longmapsto f(4)=3(4)-10`

`\\ \sf\longmapsto f(4)=12-10`

`\\ \sf\longmapsto f(4)=2`