Geometric Sequences (Grade 12 NSC Matric Mathematics): Flashcards

Each term = previous term × constant ratio

Fixed number to multiply each term by for next term

$r = \frac{T_n}{T_{n-1}}$

$T_n = ar^{n-1}$

First term of the sequence

First term has power 0, so nth has power (n-1)

Check all consecutive ratios are equal

$x = \pm\sqrt{ab}$

Multiplication (not addition)

Both positive and negative