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

SK
Answered by Sabrina K. Maths tutor

6083 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

How do you solve inequalities when they involve quadratics? i.e x^2+x-6<0


2x^2+21x=-40


What do the interior angles in a hexagon add up to?


How do I solve simultaneous equations? Such as 2x + 4y = 8, 3x + 2y = 8.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences