What must be added to x2 + 8x to make the expression a perfect
square?
Solution
a=1, b=8,c=?
We apply the formula: 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?
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