Question

show that
$f(x) = (12 - 13 \: \: x \leqslant 3 \\ 2x { \: }^{2} + 5 \: \: x > 3$
is differentiable at
$x = 3$
also find
$f(3)$
​

Answer 1

Answer:

it is an algebraic expression and all algebraic expression are differentiable.

for f(3)= put x=3 in expression.