Why does my calculator show -2^2 as -4

I'm worried that this will be a spanner in the works when I'm using a calculator in an exam , I know that $-2^2= 4$ since $(-2) \cdot (-2) = 4$. So why does my calculator show it as negative 4 ? Does anyone know if there is a way to reset my calculator so it doesn't do this? The make and model is Casio fx-83ES.

• $(-2)^2 = 4$, but $-2^2 = -(2^2) = -4$, the precedence of exponentiation is higher than that of unary minus. – Daniel Fischer Oct 15 '15 at 22:09
• I see, Thanks ! – Flewitt Connor Oct 15 '15 at 22:26
• It depends on how the calculator parses the input; for instance echo '-2^2' | bc returns 4. – egreg Mar 13 '16 at 21:38

There is a difference between $-2^2$ and $(-2)^2$ In the first examples you square the number two and then you apply the negative. In the second example you sqaure the number negative two then you get the desired reuslt, 4
This is a really simple error to correct. It's order of operations: $-2^2=-(2^2)=-4$. Your calculator is correct, just use parentheses around $-2$. $(-2)^2=4≠-2^2$.
Note that $-2^2$ is different than $(-2)^2$, which you intend.
Reviewing the order of operations, exponentiation comes before multiplication. $-2^2 = -1 \cdot 2^2 = -1 \cdot 4 = -4$.
However $(-2)^2$ is evaluated as $(-2)^2 = 4$.