Question

if 36 squared =1296 and 15 squared = 225 what is (36+15)(36-15)

Answer 1

a^2 - b^2 = (a + b)(a - b) Which is an important rule to remember!

So, substituting a = 36 and b = 15

(36 + 15)(36 - 15) = 36^2 - 15^2
= 1296 - 225
= 1071