Part a) Find the value of the cube
root of 328.509. Part b) Find the value of 7.3 minus
4.65 all squared plus the square root of 1.69.
In order to answer these questions,
we’ll need to use a scientific calculator. The cube root button on the
calculator looks like this and is often found above the square root button. This means that you’ll have to
press shift and then the square root button.
Typing the cube root of 328.509
into our calculator gives us 69 over 10, or sixty-nine tenths. If we then press the SD button on
our calculator, it turns our answer into a decimal. In this case, 69 divided by 10 is
equal to 6.9. This means that the cube root of
328.509 is equal to 6.9.
We could check this answer by
typing 6.9 cubed into our calculator, as the opposite of cube-rooting is cubing. 6.9 cubed is equal to 328.509. Therefore, our answer is
The second part of our question can
also be done by typing the whole calculation in one go into our scientific
calculator. An alternative method would be to
work it out one step at a time using our order of operations, also sometimes known
As 7.3 minus 4.65 is inside a
bracket, we’ll work this out first. 7.3 minus 4.65 is equal to
2.65. This leaves us with a calculation
2.65 squared plus the square root of 1.69. Squaring and square-rooting both
relate to indices or powers. Therefore, we can calculate these
two parts at the same time. 2.65 squared is equal to 7.0225,
and the square root of 1.69 is equal to 1.3.
There are no division or
multiplication signs in our calculation. However, there is an addition sign,
so our final step is to add 7.0225 and 1.3. This gives us a final answer of
8.3225. 7.3 minus 4.65 all squared plus the
square root of 1.69 is equal to 8.3225.