B1. For each of the following statements, first write the expression, then calculate its value for $a=-\frac{1}{2}$ and $b=-4$.

A The sum of the number $a$ and the square of the number $b$ divided by $-6$.

B Square the difference between 12 times the number $a$ and half of the number $b$.

C From the product of the sum and the difference of the numbers $a$ and $b$, subtract the quotient of the numbers $b$ and $a$.
B1. The expression is $\left(a+b^{2}\right):(-6)=\left(\left(-\frac{1}{2}\right)+(-4)^{2}\right):(-6)=-\frac{31}{12}$.

Write the expression with symbols . ...................................................................................................................................

The value of the expression is $-\frac{31}{12}$. ...............................................................................

B The expression is $\left(12 \cdot a-\frac{b}{2}\right)^{2}=\left(12 \cdot\left(-\frac{1}{2}\right)-\left(-\frac{4}{2}\right)\right)^{2}=(-4)^{2}=16$.

Write the expression with symbols ...........................................................................................

The value of the expression is 16 ................................................................ 1 point

C The expression is

$$
\begin{aligned}
(a+b)(a-b)-\frac{b}{a} & =\left(-\frac{1}{2}+(-4)\right) \cdot\left(-\frac{1}{2}-(-4)\right)-\frac{-4}{-\frac{1}{2}}= \\
& =-\frac{9}{2} \cdot \frac{7}{2}-8=-\frac{63}{4}-\frac{32}{4}=-\frac{95}{4}
\end{aligned}
$$

Write the product of the sum and difference with symbols 1 point

Write the quotient with symbols 1 point

Correct solution: $-\frac{95}{4}$ 1 point