Set A is a set of interfere greater than -12 and less than -4. B = {k, l,m, r,s, t,w, z} Find the cardinalites of A and B

n(A) =
n(B)=

step-by-step explanation:

your answer is a

answer: 1+1

step-by-step explanation: 1+1 is at least 2

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