Solve the quadratic equation: x^2 - 2x - 15 = 0

We need to find numbers that multiply together to give -15. This could be -1 and 15, 1 and -15, -3 and 5, 3 and -5. The numbers we need must add up to -2 as well (from -2x term). Therefore our set must be 3 and -5.

So we get (x+3)(x-5)=0 with x=-3 and x=5

Answered by Sabrina K. Maths tutor

5968 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

(a) Expand and simplify (x − 3)(x + 5), ..2 marks.. (b) Solve x^2 + 8x − 9 = 0 ..3 marks..


Solve the equation x^{2}-2x-15 = 0


Simplify (a) p^2× p^5 (b) Simplify g^6 ÷ g^4


Solve 3(x+4) = 18


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