Question

if f(x)=kx+8 and f(-2),find the value of k​

Answer 1

Answer:

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f(x)=kx+8

f(-2)=k(-2)+8=0

-2k=-8

2k=8

k=4

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thanx

Answer 2

The value of k = 2

Given :

f(x) = kx + 8 and f(-2) = 4

To find :

The value of k

Solution :

Step 1 of 2 :

Form the equation

Here the given function is f(x) = kx + 8

Now ,

$\displaystyle \sf{ f( - 2) = k \times ( - 2) + 8 = - 2k + 8 }$

By the given condition

$\displaystyle \sf{ f( - 2) = 4 }$

$\displaystyle \sf{ \implies - 2k + 8 = 4}$

Step 2 of 2 :

Find the value of k

$\displaystyle \sf{ - 2k + 8 = 4 }$

$\displaystyle \sf{ \implies - 2k = 4 - 8}$

$\displaystyle \sf{ \implies - 2k = - 4 }$

$\displaystyle \sf{ \implies k = 2}$

Hence the required value of k = 2

Correct question : if f(x) = kx + 8 and f(-2) = 4 , find the value of k