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Cabrillo College

Algebra 1: Lesson 075

Factoring Special Polynomials
Special Trinomials with Negative Constant

Lesson Description

Students learn that a trinomial in the form x^2 + bx + c (where c is negative), such as x^2 + 6x - 27, can be factored as the product of two binomials, in this case (x + 9)(x - 3). The first term in each binomial comes from the factors of x^2, x and x. The second term in each binomial comes from the factors of the constant term, -27, that add to the coefficient of the middle term, +6, which in this case are +9 and -3.

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