Question

factorise the following question: 81p^2-16

Answer 1

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

81p^2-16
=(9p)^2-4^2
=(9p+4)(9p-4)

Answer 2

Using the identity,

a² - b² = (a + b)(a - b)

=81p² - 16
= (9p)² - (4)²
= (9p - 4)(9p + 4)

Hope This helps you!