Thread: How to calculate

Use calculator - answer correct to 3 places.


2√11 - 3√2 + 15√10 + 5√5 = How would I punch this into calculator? If I type it in as it is, it says "domain error"

(3√17 + 2√15)/5√7 = How to punch this in calc.


2/17 + 3/19 - 1/7 = How to punch this in calc. Do I need to bracket each fraction or type as it is?

Thanks for helping!

Read the manual. We can't tell

Use calculator - answer correct to 3 places.

2√11 - 3√2 + 15√10 + 5√5
sol :first of all you have to do the squareroot of 11=3.317
then multiply it with 2,we get 2√11=6.634

similarly find 3√2,15√10,5√5
now put these values in
2√11 - 3√2 + 15√10 + 5√5=6.334-4.243+47.434+11.180
=61.005
similarly you can do other parts

What type of calculator are you using? I assume it is a graphing calculator.

Generally you need to put parentheses around what you are taking the root of. You might also need the multiplication sign. So #1 equals:

2*√(11) - 3*√(2) + 15*√(10) + 5*√(5)

The same holds for #2, which equals

(3*√(17) + 2*√(15))/5*√(7)

You do not need brackets for the fractions in #3 because division comes before addition in the order of operations. So the way you wrote it is fine.

Thanks for the suggestions Ragnarok and slovakiamaths! Appreciate it.