Solve the equation x^2-9x+20=0

First, we need to factorise the equation on the left hand side, this can be done by finding two numbers that add together to make the 'b' coefficient (-9) and multiply to make the 'c' coefficient (20).

This will give -5 and -4. Therefore, (x-5)(x-4)=0. So, either (x-5)=0, or (x-4)=0 Giving x=5 or x=4 as the final answers.

JB
Answered by Joseph B. Maths tutor

28672 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

In the generic formula 'y=mx + c,' how do you use the 'm' and 'c' to plot a linear graph?


A circle has the equation x^2 + y^2 = 25. There is a point P on this circle with coordinates (4,3). A line is drawn tangental to the circle at point P. This line crosses the x axis at point Q. Find the co-ordinates of Q.


Represent x = 0.0154 recurring as a fraction.


Express 300 as a product of its prime factors.


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