Question

1. a ²+b²= 25, ab=12 , (a+b)=?
(A)3
(B) 13
(C) 7
(D) 25​

Answer 1

Answer:

7

Step-by-step explanation:

(a+b)^2=a^2+b^2+2ab

(a+b)^2=25+2(12)

(a+b)^2=25+24

(a+b)^2=49

(a+b)=✓49

a+b=7

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Answer 2

Answer : (C)

Explanation :

a²+b²=25

and,ab=12

a²+b²=25

or,(a+b)²-2ab=25

or,(a+b)²-2.12=25

or, (a+b)²=25+24

or, a+b = √49

or, a+b =7

so,a+b =7 (C) .

( Ans)