Question

Solve (factorise) the below problem using a²- b² =(a-b) (a+b)

z³-81z

Answer 1

Here we goo....
z(z^2-81)

z[(z^2-9^2)]

z(z+9)(z-9)...

Hope it helps..... (｡’▽’｡)♡

Answer 2

Answer:

Step-by-step explanation:

a² - b² = (a-b)(a+b)

a² - b² = a(a+b)-b(a+b)

a² - b² = a² + ba - ba - b²

a² - b² = a² - b²

z³-81z

z(z²-81)