Question

Calculate: 199^2- 198^2

Answer 1

397

Explanation:

`\boxed{a^2-b^2=(a+b)(a-b)}`

199² - 198² = (199 + 198)(199 - 198)

= [(200 - 1) + (200 - 2)](1)

= 200 + 200 - 1 - 2

= 397