1) the nth term of a sequence is 25-3n
a) work out the first three terms.
b) work out the value of the first negative term.

see explanation

Step-by-step explanation:

To find the first 3 terms substitute n = 1, 2, 3 into the formula

(a)

= 25 - (3 × 1) = 25 - 3 = 22

= 25 - (3 × 2) = 25 - 6 = 19

= 25 - (3 × 3) = 25 - 9 = 16

The first three terms are 22, 19, 16

Note the difference between consecutive terms is - 3

19 - 22 = 16 - 19 = - 3

Continuing this pattern

(b)

16 - 3 = 13

13 - 3 = 10

10 - 3 = 7

7 - 3 = 4

4 - 3 = 1

1 - 3 = - 2

The first negative term is - 2

answer: 38.47 is your answer

step-by-step explanation: hope i you and who ever sees this answer have a great rest of your day : )

- 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