What is (18)^1/2 -(8)^1/2 simplified?

In order to answer this we will break down the two surds into their factors. So we know that 18 is 2 multiplied by 9 and so (18)^1/2=(92)^1/2 which cane be broken down into (9)^1/2(2)^1/2 .We know that (9)^1/2=3 and so (18)^1/2=((2)^1/2)3For (8)^1/2 we have that 8=42 and so by the same method as above we have (8)^1/2=(4)^1/2*(2)^1/2=2(2)^1/2So (18)^1/2-(8)^1/2=3(2)^1/2-2(2)^1/2=(2)^1/2

Answered by Hannah M. Maths tutor

2065 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Solve the following to find x. x^2 +3x -10 =0


One of the teachers at a school is chosen at random. The probability that this teacher is female is 3/5 There are 36 male teachers at the school. Work out the total number of teachers at the school.


3/5 of a number is 162. Work out what 4/5 of the same number is.


Karen got 32 out of 80 on a Maths test. She got 38% on an English test. Which test did she do better in?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences