Answer
$21.5$
Work Step by Step
Substitute $-2$ to $x$ to obtain:
$3(-2)^2-5(-2)+\frac{1}{-2}$
First, you must solve the operations with an exponent different from 1, which is $(-2)² = 4$
$3\times(4)-5\times(-2)+\frac{1}{-2}$
Then, you can find its products and quotient before you solve the addition
The product of two positive numbers is a positive number
$3\times4 = 12$
The product of two negative numbers is a positive number
$(-5)\times(-2) = 10$
The quotient of a positive and a negative number is negative
$\frac{1}{-2} = -0.5$
The total value of the expression is:
$=12+10-0.5
\\= 21.5$
