Question

if a +b=4 And ab= -12 find (i)a-b

Answer 1

a+b=4 ab=-12
ab=-12
then in a+b=4
a=b-4
put in ab=-12
(b-4)b=-12
b2-4b+12=0
b2+6b-2b+12=0
b(b+6)-2(b+6)=0
(b+6)(b-2)=0
b=-6,2
then a+b=4
a+2=4 , a-6=4
a=2 , a=4+6=10
then a-b=2-(-6)=8
and a-b =10-2=8
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Answer 2

Answer:

Step-by-step explanation: