How do you use the quadratic formula?

So we use the quadratic formula to find out 2 values of x satisfies the quadratic equation we have been given. First we need to write the quadratic formular down, (x=-b.. etc). If you see, we need to plug in 3 different numbers corrosponding to a, b and c into the formula to find what x is. A, b and c can be found by looking at the numbers in front of the x terms in our quadratic equation. 'A' is the number found before the x2 term, 'b' before the x term and c is the final number which isnt linked to one of the x terms. If you insert these numbers into the quadratic formula, once adding the square root and once minusing it, you will get the 2 values of x you have been looking for. 

Answered by Amy B. Maths tutor

2833 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

The number of uniform spherical balls that can be produced from a given mass of lead is inversely proportional to the radius of the ball cubed. If 2744 balls can be made when the radius is 1mm, how many balls can be made when the radius is 1.4mm ?


A lorry can travel 35 miles per litre of diesel that costs £7.30 per litre. What is the cost in £ (to the nearest 2 decimal places) of the diesel used in driving the lorry 200 miles?


Divide £700 in the ratio 5:3:2


Find the points at which the equation y = x^2 - 12x + 35 intersects the x-axis.


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