A, a +4,a+
write the nth term of sequence in terms of the first term of the sequence

1)

a1 = 2*5

a2= 2*2*5

a3= 2*3*5

...

an=2n -*5

2)

u1 = a

u2 = a +4

u3 = a + 2 * 4

u4 = a + 3 * 4

...

un = a + ( n - 1 )* 4

- 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

d

step-by-step explanation: