Question

If f(x)=x3+x,find f(1)+f(2) ?

Answer 1

Answer:

⭐ Answer ⭐

$f(1) = ({1})^{3} + 1 \\ \\ = 1 + 1 = 2 \\ \\ f(2) = ({2})^{3} + 2 \\ \\ = 8 + 2 = 10 \\ \\ f(1) + f(2) = 2 + 10 \\ \\ = 12$

Answer 2

Given,

f(x)=x3+x

To Find,

f(1)+f(2) = ?

Solution,

Given equation, $f(x) =x^3 + x$

Now putting x=1 in this equation,

$f(1) =1^3 + 1\\f(1) =1 + 1\\f(1) = 2$

Value of f(1) = 2

Similarly, putting x= 2 in given equation,

$f(2) =2^3 + 2\\f(2) =8 + 2\\f(2) = 10$

Value of f(2) =10

Therefore, f(1) +f(2) =2 + 10 = 12

Hence, in f(x)=x3+x,  f(1)+f(2) = 12