Show that x^2 - x +2 is positive for all values of x

(x-1/2)= (x-1/2)(x-1/2)=x2-x+1/4, add 7/4 to get x2-x+2 therefore x2-x+2 = (x-1/2)2 + 7/4

squared numbers always positive so (x-1/2)2 >= 0 therefore (x-1/2)2 + 7/4 is always positive

PM
Answered by Pearse M. Maths tutor

10851 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

Find the factors of x^3−7x−6


Find the integral of 4sqrt(x) - 6/x^3.


Differentiate (2^x)(5x^2+5x)^2.


How do you take the derivative of a^x ?


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