Question

if f(x)=3-4x. find ∑10 r=1 f(r)

Answer 1

Step-by-step explanation:

We have,

$f(x) = 3 - 4x$

Now,

$f(1) + f(2) + f(3) + ... + f(10)$

$= (3 - 4 \times 1) + (3 - 4 \times 2) + (3 - 4 \times 3) + .... + (3 - 4 \times 10)$

$= 10 \times 3 - 4(1 +2 + ... + 10)$

$= 30 - 4 \times 55$

$= - 190$