Resolve into factors.

a)x4-5x2y2+4y4

(x - y)(x + y)(x - 2y)(x + 2y)

Step-by-step explanation:

Given

- 5x²y² + 4

Consider the factors of the coefficient of the term (+ 4) which sum to give the coefficient of the x²y² term (+ 5)

The factors are - 1 and - 4 , thus

- 5x²y² + 4

= (x² - y²)(x² - 4y²)

Both of these factors are differences of squares which factor in general as

a² - b² = (a - b)(a + b) , so

x² - y² = (x - y)(x + y)

x² - 4y²

= x² - (2y)² = (x - 2y)(x + 2y)

Hence

- 5x²y² + 4

= (x - y)(x + y)(x - 2y)(x + 2y) ← in factor form

the answer i believe is 27 units.

step-by-step explanation:

change of stock price/initial stock price on friday * total stock value = change of stock value

0.89/73.73 *x = 42.72

x=3539.04 = total stock value at initial stock price on friday .

total stock value at initial stock price on friday/ initial stock price on friday = number of shares

3539.04/73.73 = 48 shares

they own 48 shares of this stock