Question

if a+b=5 and ab=4,then a-b is what

Answer 1

Step-by-step explanation:

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

25=a^2+b^2+2(4)

a^2+b^2=25-8=17

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

(a-b) ^2=17-8

(a-b) ^2=9

(a-b) = +3

(a-b) =-3

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Answer 2

see the attachment

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