Answer:
" We can determine whether a calculator correctly performs the order of operations with the help of considering a simple example and solve it manually as well calculate the value in calculator and check whether it holds true.
If the calculator shows same value as we have calculated manually than calculator will calculate it for complex problems as well "
EXAMPLE:
We will use the PEDMAS (i.e. first solve the paranthases than solve for exponent, then for multiplication then division, then for addition and subtraction) rule to calculate our problem:
Consider our problem as:
[tex](5+3)^2-15\div 3+5[/tex]
firstly we will calculate it Manually as:
[tex](5+3)^2-15\div 3+5\\\\=(8)^2-15\div 3+5\\\\=64-15\div 3+5\\\\=64-5+5\\\\=64+0\\\\=64[/tex]
also when we will calculate it by calculator we get:
[tex](5+3)^2-15\div 3+5=64[/tex]
Hence, the calculator does the correct calculations.
Hence this type of calculator will be reliable.
