Question

f(1/2) = 3. (1/2)² - 1/2 + 4

Se possivel com explicação

Answer 1

$3*( \frac{1}{2})^2 - \frac{1}{2}+4\\\\3*( \frac{1^2}{2^2} )- \frac{1}{2}+4 \\\\3* \frac{1}{4}- \frac{1}{2}+4 \\\\ \frac{3}{4}- \frac{1}{2}+4$

soma de frações
$\boxed{ \frac{A}{B} + \frac{C}{D}= \frac{A*D+C*B}{B*D} }$

aplicando isso
$\frac{3}{4}- \frac{1}{2}+4\\\\ \frac{3*2 -1*4}{4*2}+4 \\\\ \frac{6-4}{8} +4\\\\ \frac{2}{8}+4 \\\\ \frac{2+4*8}{8}\\\\ \frac{2+32}{8}= \frac{34}{8} = \frac{17}{4}$