Know Your Keywords — Math, Standard
Point 20 — Factorisation
What do we see?
“Which expression is a factor…” or “…cannot be a factor…”
What do we understand?
- Factor theorem: if (x − k) is a factor, then f(k) = 0.
- For 4 terms: group 2 terms at a time.
- Look out for a2 − b2 and a4 − b4.
Question 1 of 4
Which expression is a factor of 81p21 − 121p19?