Question

Dado a função f(x)= -3x + 15, calcule: A) f( -6)=

B) f (1/6)=​

Answer 1

$f\left(x\right)=\:-3x\:+\:15,\:f\left(-6\right)=\\\\=-3\left(-6\right)+15\\\\-3\left(-6\right)+15\\\\=18+15\\\\=33$

$f\left(x\right)=\:-3x\:+\:15,\:f\left(\frac{1}{6}\right)=\\\\=-3\cdot \frac{1}{6}+15\\\\-3\cdot \frac{1}{6}+15\\\\=-\frac{1}{2}+15\\\\=\frac{15\cdot \:2}{2}-\frac{1}{2}\\\\=\frac{15\cdot \:2-1}{2}\\\\=\frac{29}{2}$