MYTUTOR SUBJECT ANSWERS

390 views

What is the quadratic formula and how do I use it?

The quadratic formula is a way of solving quadratic equations of the form: ax2+bx+c=0. By plugging in the values a,b and c into it, the solutions for x can be obtained:

x = [-b +/- sqrt(b2-4ac)]/2a 

For example, solving 2x2+3x-5=0:

a = 2, b = 3, c = -5 so inputting these values into the formula above:

x = [-3 +/- sqrt(32-4(2*-5)]/(2*2)

x = 1 or x = -5/2

These can be checked by inserting them into the original equation, or using a graphical method looking at the x-intercept coordinates.

Patrick M. GCSE Maths tutor, Mentoring Maths tutor

1 year ago

Answered by Patrick, a GCSE Maths tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

434 SUBJECT SPECIALISTS

£18 /hr

Hannah S.

Degree: natural sciences (Masters) - Exeter University

Subjects offered: Maths, Physics+ 2 more

Maths
Physics
Chemistry
Biology

“About me: I am a third year Natural Sciences student at Exeter University. I've always loved education and find helping others with theirs extremely rewarding and enjoyable. I tutored GCSE students throughout my A levels at school and ...”

£22 /hr

Sarah R.

Degree: Physics (Bachelors) - Exeter University

Subjects offered: Maths, Physics+ 2 more

Maths
Physics
Economics
-Personal Statements-

“Hi! I'm Sarah and I'm a second year Physics student at the University of Exeter.  Maths and Physics have been a huge part of my education and general interests for a long time and I hope that I can pass on my knowledge and enthusiam t...”

£18 /hr

Emily W.

Degree: Mathematics (Bachelors) - Leeds University

Subjects offered: Maths

Maths

“I am a friendly, passionate Mathematics student at the University of Leeds. I have always enjoyed and had a real enthusiasm for maths, and through my tutorials I wish to inspire this in you too. Since year 12 I have tutored maths to s...”

About the author

Patrick M.

Currently unavailable: no new students

Degree: Aerospace Engineering (MEng) (Masters) - Bristol University

Subjects offered: Maths

Maths

“Hello there!  I'm a third year Aerospace Engineering student at the University of Bristol. During school I was part of a mentoring scheme for younger students and since completing my A-Levels I've taken up regular one-to-one tutoring ...”

MyTutor guarantee

You may also like...

Other GCSE Maths questions

Lisa, Max and Punita share £240 in the ratio 3 : 4 : 8 How much more money than Lisa does Punita get?

Find the highest common factor of 432 and 522

How do I expand and simplify linear equations?

How can i solve the following simultaneous equations? 5x + y = 4 and 3x + 2y = 5?

View GCSE Maths tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok