Question

Find f(-2) for (x) = 3 . 2^x O A. -36 O B. -12 O c.1/36 O D. 3/4

Answer 1

$\\ \rm\Rrightarrow f(x)=3.2^x$

• Put -2

$\\ \rm\Rrightarrow f(-2)$

$\\ \rm\Rrightarrow 3.2^{-2}$

$\\ \rm\Rrightarrow 3(1/4)$

$\\ \rm\Rrightarrow 3/4$

Answer 2

$\sf f(x) = 3 \ * \ 2^x$

insert x = -2

$\sf f(-2) = 3 \ * \ 2^{-2}$

$\sf f(-2) = 3 \ * \ \dfrac{1}{4}$

$\sf f(-2) = \dfrac{3}{4}$

option D. 3/4 will be the correct answer.