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

4223 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Naoby invests £6000 for 5 years. The investment gets compound interest of x% per annum. At the end of 5 years the investment is worth £8029.35 Work out the value of x.


Find the values of x given the equation (4x^2)-3x+1=2 using the quadratic formula.


Solve the simultaneous equations: 3x+2y=11, 2x-5y=1.


Find the volume of a right angled triangular prism with an angle of 28 degrees, hypotenuse of length 10 cm, and projected length of 12.5 cm. Give your answer in cm^3, to three significant figures.


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