1i) solve x^2-4x-21=0

Factorise to get (x+3)(x-7)=0 
So you can see that x = -3 or x =7 

KI
Answered by Kishwar I. Maths tutor

3581 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Text books are stored on two shelves. Each shelf is 0.72m long. Each textbook is 30 millimetres wide. Could 50 textbooks be stored on these shelves? (3 marks)


Solve these 2 equations simultaneously: 7x+y=1 and 2x squared - y=3


Joe buy a pack of 7 chocolate bars. The pack costs £5.97, Joe sells all 7 chocolate bars for 87p each. Work out Joes percentage profit to 2 decimal places.


Probability: These 6 coins are in a box - 10p, 10p, 10p, 20p, 20p, 50p. Someone takes 2 coins at random. What is the probability that the total value of the two coins is at least 40p?


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