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

5681 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Finding the value of x when 3x + 5 = 35


A right angled triangle with sides 7cm and 11cm, find the hypotenuse


How do you divide two fractions?


1/4 of a number is 20. What is 5 times the number?


We're here to help

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