It is a way for students to remember how to find the product of two binomials.
The 'foil' method, stands for "Firsts, Outers, Inners, Lasts".
It is a way for students to remember how to find the product of two binomials. The advantages might be:
It is a learnable process so that new or weak students have a way of knowing what to do next
It is a method which can be repeated in any example of 2 terms multiplied by 2 terms.
It is a reminder that 4 terms must be obtained from the multiplying.
It is an extension of the distributive property, where 2 terms are being distributed across a bracket.
However it is limited to two binomials.