Answer
$2.75$
Work Step by Step
Plugging in $\frac{3}{4}$ to $x$, we get
$=4 \cdot \left(\frac{3}{4}\right)^2+2\left(\frac{3}{4}\right)-1\\\\
= 4 \cdot \frac{9}{16} +\frac{6}{4}-1\\\\
=\frac{9}{4}+\frac{6 }{4}-1\\\\
=\frac{15}{4}-1\\\\
=\frac{15}{4}-\frac{4}{4}\\\\
=\frac{11}{4}\\\\
=2.75$
