Q. 185.0( 3 Votes )

# What must be adde

Answer :

(i)

_{(2x)}^{2} – 2 (2x) (3) + 3^{2} – 3^{2} + 7

_{= (2x – 3)}^{2} – 9 + 7

_{= (2x – 3)}^{2} – 2

_{Hence, 2 must be added to the expression in order to make a whole square}

(ii)

(2x)^{2} – 2 (2x) (5) + 5^{2} – 5^{2} + 20

= (2x – 5)^{2} – 25 + 20

= (2x – 5)^{2} – 5

Hence, 5 must be added to the expression in order to make it a whole square

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