How to work out /17^2-15^2?

2 Answers
Dec 28, 2017

64

Explanation:

The difference of two squares can be written as

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

Using this formula,

17^2 - 15^2 = (17 + 15)(17-15)
17^2 - 15^2 = (32)(2)
17^2 - 15^2 = 64

Dec 28, 2017

64

Explanation:

"using the "color(blue)"difference of squares"

•color(white)(x)a^2-b^2=(a-b)(a+b)

rArr17^2-15^2

=(17-15)(17+15)

=2xx32=64