Question

if a+b=7 and ab=10 find a-b​

Answer 1

Answer:

Step-by-step explanation: (a+b)^2=a^2 +b^2 +2ab

7^2 = a^2 + b^2 + 2×10

49-20=a^2+b^2

a^2+b^2=29

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

=39-2×10

=9

a-b =√9

=3