Question

i don't understand the number 27 and 28 please explain

Answer 1

Part 27

we have the expression

a-4b

For a=7 and b=2

Substitute the value of and the value of b in the expression

so

7-4*(2)=7-8=-1

the answer part 27 is -1

Part 28

we have

$w^2+2xy$

For w=-2, x=-3 and y=1

substitute the given values in the expression

$\begin{gathered} (-2)^2+2(-3)(1) \\ 4-6 \\ -2 \end{gathered}$

the answer part 28 is -2