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

2063 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Factorise y^2 - y - 12


Solve the quadratic equation X^2+3X+2=0 by factorisation.


How do you calculate a number to the power of a fraction? (8^2/3)


Point A (-3,5) and point B (1,-15) are to be connected to form a straight line, fing the equation of the line in the form y=mx+c?


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