Give the possible values of x when x^2 - 5x + 4 = 0

First, when faced with a question like this you must factorise the expression. So we need to factorise x2-5x+4 into 2 linear parts. (Linear terms are terms without any powers of x). To do this, we need to find 2 numbers that add together to make -5 and times together to give 4. The only numbers that have both of these properties are -4 and -1.So we have (x-4)(x-1)= x2-5x+4. To check this we can expand out the brackets.We now need to solve (x-4)(x-1)=0 to solve our original question. As we know, anything multiplied by 0 gives 0, therefore (x-4)=0 and (x-1)=0 are two solutions to the problem, therefore x=4 or x=1 by rearranging.

Answered by Sam D. Maths tutor

4147 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Tom is making gift bags, each of which will contain two balloons. He wants to hide a sweet in one of the balloons. 20 balloons cost £1.33, 15 sweets cost £2.05. What is the minimum he needs to spend to make 35 bags?


Solve X^2 +13X+48=12


Where do the two lines intersect? (a) 3x+6y= 15 (b) y= 6x -4 (GCSE-Higher Tier)


Solve the simultaneous equations: 2x + y = 5 , x + 4y = -22


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 2013–2024

Terms & Conditions|Privacy Policy
Cookie Preferences