Difference of Two Squares (Leaving Cert Mathematics): Flashcards

$a^2-b^2=(a+b)(a-b)$

No, must be memorized

A term expressed as a product of the same term

$(3)(3)$

$(x)(x)$

$(5ab)(5ab)$

Square terms separated by a minus

Rewrite in form $a^2-b^2$ to identify $a$ and $b$

$(y+10)(y-10)$

$(9x^2)^2-(4y^4)^2$

When HCF factorisation is needed first

$2x(x+5)(x-5)$