By factorising, solve the quadratic equation x^2-8x+15=0

First we find two numbers that that add up to -8 and multiply to make 15. In this case the numbers are -3 and -5. This means we can now factorise the quadratic to give (x - 5) (x - 3) = 0. For the above to be true, either (x - 3) = 0 or (x - 5) = 0. So x = 3 or x = 5.

Answered by Ivo N. Maths tutor

2988 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Solve the simultaneous equations x^2+y^2=1 and x+2y=1


make y the subject of this expression p = ((x+y)/5)^1/2


Simplify the following: 5(x+2) - 3(6-x)


Functions question: f(x) = 3x + 2a; g(x) = ax + 6; fg(x) = 12x + b. a and b are constants; Work out the value of b


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