QUADRATICS 1

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

Solution

a=1, b=8,c=?

b² = 4ac

(8)² = 4 x 1 x c

64 = 4c

64 = 4c

4      4

16 = c

Hence number to be added is 16

TRY THIS……………………

What must be added to x²  + 12x to make the expression a perfect square?