Question

Evaluate the following by factorising
a) 15² - 13²​

Answer 1

Here apply the formula

${a}^{2} - {b}^{2} = (a + b)(a - b)$

Here

15^2-13^2

= (15+13)(15-13)

= (28)(2)

= 56

hope it helps ✌

Answer 2

Here apply the formula

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

2

−b

2

=(a+b)(a−b)

Here

15^2-13^2

= (15+13)(15-13)

= (28)(2)

= 56