The 2nd term of an exponential sequence is 9 while the 4th term is 81.find the common ratio, the first term and the sum of the first five terms of the sequence

second term: 9

4th term:81

=729

3rd term=27

a1=3 the first term

q=3

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form