Presentation Title

When Do The Quadratic Polynomials px^2+qy+r And 2px^2+qy+r Both Factor?

Presenter Information

Brooke Hatanaka

Mentor

Vincent Ferlini

Location

David F. Putnam Science Center - 126

Abstract

One mathematical skill developed in a high school algebra class involves factoring a quadratic polynomial into a product of two binomials. For example, x^2+17x+30=(x+2)(x+15). If a 2 is placed in front of the x^2, the polynomial 2x^2+17x+30 factors as(2x+5)(x+6). A good exercise for students is to find other quadratic polynomials〖px〗^2+qy+r and〖2px〗^2+qy+r that both factor. A pair of quadratic polynomials with this property is called a quadratic doublet. The first part of this talk will characterize values for p, q, and r that yield quadratic doublets. A Pythagorean Triple is three whole numbers a, b, c with the property that a^2+b^2=c^2 . The second part of the talk will show a connection between the quadratic doublets and Pythagorean Triples.

Share

COinS
 
Apr 11th, 9:10 AM Apr 11th, 10:10 AM

When Do The Quadratic Polynomials px^2+qy+r And 2px^2+qy+r Both Factor?

David F. Putnam Science Center - 126

One mathematical skill developed in a high school algebra class involves factoring a quadratic polynomial into a product of two binomials. For example, x^2+17x+30=(x+2)(x+15). If a 2 is placed in front of the x^2, the polynomial 2x^2+17x+30 factors as(2x+5)(x+6). A good exercise for students is to find other quadratic polynomials〖px〗^2+qy+r and〖2px〗^2+qy+r that both factor. A pair of quadratic polynomials with this property is called a quadratic doublet. The first part of this talk will characterize values for p, q, and r that yield quadratic doublets. A Pythagorean Triple is three whole numbers a, b, c with the property that a^2+b^2=c^2 . The second part of the talk will show a connection between the quadratic doublets and Pythagorean Triples.