Question

If a+a-b=7 ab=18 a+b=?​

Answer 1

Step-by-step explanation:

(a-b)²=a²+b²-2ab

7² =a²+b²-2*18

49 =a²+b²-36

49+36=a²+b²

85=a²+b²

(a+b)²=a²+b²+2ab

( a+b)²=85+36

= 121

(a+b) =√121

=11

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Answer 2

Step-by-step explanation:

15.......................