Question

14. If x + y = 12 and xy = 14, find the value of (x + y ).
15. If x - y = 7 and xy = 9, find the value of (x+y).​

Answer 1

Step-by-step explanation:

14. x+y = 12

x×y = 14

so the 2 factors of 14 whose sum will be 12 are no-one

so the question is wrong

15. x-y=7

xy = 9

so difference of 2 factors of 9 will be 7 are no one

so this answer is also wrong..

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Answer 2

Step-by-step explanation:

x+y=12

xy=14

14ans) x2+y2=(x+y)2-2xy

=(12)2-2(14)

=144-28

=116

15ans) x-y=7

xy=9

x2+y2=(x-y)2+2xy

(7)2+2(9)

49+18

=67