Question

if a-b=7 and ab=10 find a+b

Answer 1

Answer:

a -b = 7

ab= 10

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

(7)^2 =a^2 +b^2 -2*10

49 =a^2 +b^2 -20

49+20 = a^2 +b^2

69 = a^2 +b^2

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

(a+b)^2 = 69 +2*10

(a+b)^2 = 69 +20

(a+b)^2= 89

(a+b)^2 = 89

(a+b) = +-√89

a+b = +- 9.43

Step-by-step explanation:

+- this is plus minus

hope this will help you