Evaluate {(405)2 – (395)2}

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

Q27 of 137 Page 100

Evaluate {(405)² – (395)²}

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

Factories:

9a² – b² + 4b – 4

Factories:

100 – (x – 5)²

Evaluate {(7.8)² – (2.2)²}.

Factorize:

x² + 8x + 16