A sequence is defined by the term-to-term rule un = u. - 3u, +1
Given that u, = 3,
a) find u2
b) find u3
c) find u4

oof tough question

step-by-step explanation:

sorry i can't ya : c gl tho

fyuh

step-by-step explanation:

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just took the test and my answers down below!

step-by-step explanation:

check the pic :

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81