Question

if a+b = 8 and ab=15÷4 then a- b​

Answer 1

Answer:

a+b=8

b=8-a

ab=15/4

(8-a)a=15/4

32a-4a²=15

4a²-30a-2a+15=0

Therefore

a=15/2or1/2

b=1/2or15/2

Answer 2

Step-by-step explanation:

a+b=8 and ab= 15÷4

a-b = ?

(a-b) ^2

(a-b)^2 = (a+b)^2 - 4ab

(a-b)^2 = 8^2 - 4.15/4

(a-b)^2 = 64 - 15

(a-b)^2 = 49

(a-b) = 7

HOPE IT HELPS YOU