Question

Evaluate (18)^2-(15)^2
Please show working.

Answer 1

99

Explanation:

Evaluate

= (18)^2-(15)^2

= 324 - 225

= 99

Answer 2

99

Explanation:

You can solve it by Squaring/multiply 18 by itself and 15 by itself then subtract them both:

(18 × 18) - (15 × 15)

324 - 225

99

You could also do difference of two squares:

(x² - y²)

= (x + y) (x - y)

= (18 + 15) (18 - 15)

= (33) (3)

= 99