Find the zeroes of the quadratic polynomial x^2 + 8x + 15.

x2+8x+15 = (x+3)(x+5)So, the value of x2+8x+15 is zero when x2+8x+15 = 0 i.e. x = -3 or x = -5.

PS
Answered by Piyush S. Maths tutor

21966 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Find the gradient of the line on which the points (1,3) and (3,4) lie and find the y-coordinate of the line at x = 7.


There are n sweets in a bag, 6 of which are orange. If the probablility of eating 2 orange sweets from the bag, one after the other, is 1/3, show that n^2 - n - 90 = 0. State any assumptions made.


Why is completing the square useful and how do you do it?


How many roots does the following equation have? 2x^2 + 4x +2 = 0


We're here to help

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

MyTutor is part of the IXL family of brands:

© 2026 by IXL Learning