Evaluate {(405) 2 – (395) 2 }

Question

Evaluate {(405) 2 &#x2013; (395) 2 }

Philoid · Accepted Answer

Given,

{(405)² – (395)²}

By using the formula a² – b² = (a + b)(a – b)

We get,

{(405)² – (395)²} = (405 + 395)(405 – 395)

= (800 × 10)

= 8000