Question

11. If f(x) = a.x+5, and f(1) = 15, the value of 'a' is ?
(a) 5
(b) 0
(c) 15
(d) 10​

Answer 1

Answer:

(D)-10

Step-by-step explanation:

f(x) =ax+5-------(1)

given;

f(1)=15--------(2)

PUT VALUE OF (2) IN (1)

SO, f(1)=a*1+5

=>15=a+5

=> a=15-5=10

Answer 2

Option d

Step-by-step explanation:

Given:-

f(x) = a.x+5

f(1) = 15

To find:-

Find the value of a ?

Solution:-

Given that :-

f(x) = a.x+5

Put x = 1 in the above then

=> f(1) = a(1) + 5

=> f(1) = a + 5

According to the given problem

f(1) = 15

=> a + 5 = 15

=> a = 15 - 5

=> a = 10

Therefore , a = 10

Answer:-

The value of a for the given problem is 10

Check :-

f(x) = a.x + 5

If a = 10 then

=> f(x) = 10x+5

=> f(1) = 10(1)+5

=> f(1) = 10+5

f(1) = 15

Verified the given relation.