QUADRATICS K1

 

What must be added to x²  + 60x to make the expression a perfect square?

Solution

a=1, b=60,c=?

b² = 4ac

(60)² = 4 x 1 x c

3600 = 4c

3600 = 4c

 4        4

 

900 = c

Hence number to be added is 900

 

TRY THIS……………………

What must be added to x²  + 24x to make the expression a perfect square?