Question

I need help solving this and also what does the 2 that's on the top of some letters mean

Answer 1

given the expression :

`a-bc^2`

We need to evaluate the expression when :

`\begin{gathered} a=3 \\ b=2 \\ c=-1 \end{gathered}`

So, substitute with a , b and c at the expression

The result will be :

`\begin{gathered} a-bc^2 \\ =3-2\cdot(-1)^2 \\ =3-2\cdot1 \\ =3-2 \\ \\ =1 \end{gathered}`

There is another expression :

`c^2+a^2b`

By substitute with the values of a, b and c

so, the result will be :

`\begin{gathered} c^2=(-1)^2=1 \\ a^2=3^2=9 \\ \\ c^2+a^2b=1+9\cdot2=1+18=19 \end{gathered}`