Question

If the side of a square increases by 30 then its area increases by

Answer 1

Let the side be " x " .
Area = x² .

Side is increased by 30 .
New side = x + 30 .

New area = (x+30)²

Increase in Area = ( x+30)²-x² = [ x + 30 + x ] [ x + 30 - x ]
= ( 2x + 30 ) ( 30)
= 60x + 900