Question

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18 x 33
What should be added to 3x2 + xy + 3y2 to
obtain 4x2 +6xy ?
(1) x2 +5xy -3y?
(2) x2–5xy – 3y2
137 x2 +5xy +3y2
(4) x2 +6xy – 3y2
​

Answer 1

Answer:

( The sign * means multiplication )

To obtain the number we will have to subtract 4*2 + 6xy by 3*2 + xy + 3y2.

( 4*2 + 6xy ) - ( 3*2 + xy + 3y2 )

( 8 + 6xy ) - ( 6 + xy + 3y2 )

8 + 6xy - 6 - xy - 3y2

2 +5xy - 3y2

Hence, 2 +5xy - 3y2 should be added to  3*2 + xy + 3y2 to obtain 4*2 + 6xy.