Using the following quadratic equation, find x: x2 + 3x -4

x2 +3x -4. (x + a) (x - b) x has no co-efficient so each is 1 x.  next find two numbers with a product of -4 and a sum of +3.  cannot be 2,2 as these numbers have a sum of -4, 0 or +4 depending on whether they are positive or negative.  so.. +4 and -1.  (x+4)(x-1)  x = -4 or +1

JC
Answered by Jake C. Maths tutor

3427 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Simplify, leaving your answer as a quadratic: (2x + 3)/(x+4) - (3x - 6) = 4


Factorise the expression given


A truck travels 110 miles in 2 hours. What is the average speed of the truck?


How do I solve a simultaneous equation?


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