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vodka [1.7K]
4 years ago
8

Find the number that should be added to the expression to make a perfect square k^2+11k

Mathematics
1 answer:
Alja [10]4 years ago
5 0
<span>k^2+11k has 11 as the coefficient of the first power of the variable (k).

To complete the square:

Take HALF of this coefficient.  In other words, take HALF of 11, obtaining 11/2.

Square this (11/2):  (121/4)

Add this 121/4   to  </span><span>k^2+11k 

Result:     </span><span>k^2+11k + 121/4

This is a perfect square:    </span>k^2+11k + 121/4  = (k + 11/2)^2

Answer:  The number to be added to k^2 + 11k to make it a perfect square is  (121/4).
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