PERFECT SQUARE 1

What must be added to x²  + 6x to make the expression a perfect square?

Solution

a=1, b=6,c=?

b² = 4ac

(6)² = 4 x 1 x c

36 = 4c

36 = 4c

4      4

9 = c

Hence number to be added is 9.

TRY THIS……………………

NECTA 2013,  QN. 10a

What must be added to x²  + 8x to make the expression a perfect square?