Maths

>

A-Level

Algebra & Functions

Question

If the discriminant is greater than zero then ...........

3 years ago

·

1 Reply

·

1902 views

J

Jack Lynch

State how many (if any) positive/negative roots you should expect.

1 Answer

Devan-Kumar M Profile Picture
Devan-Kumar M Verified Sherpa Tutor ✓

Young experienced tutor w a unique understanding of exam specification

3 reviews

If the discriminant is greater than 0, then you should have two unique roots for the quadratic equation, which can both be positive or negative, or one positive one negative.

This is easily seen as, if you let n = the discriminant, then the quadratic formula becomes x = (-b +- sqrt(n))/2a; and if sqrt(n) > 0, which we know is true, then there will be two unique values of x.

I'm available for 1:1 private online tuition!

Click here to view my profile and arrange a free introduction.

Think you can help?

More Maths A-Level Questions
Sherpa Badge

Need an A-Level Maths tutor?

Get started with a free online introductions with an experienced and qualified online tutor on Sherpa.

Find an A-Level Maths Tutor