If a - b = 5 and ab = 6, find a + b.
Answers
Answered by
3
Answer:
a+b=7 , -7
Step-by-step explanation:
a-b=5
a=b+5
ab=6
(b+5)×b=6
b²+5b=6
b²+5b-6=0
b²+6b-b-6=0
b(b+6)-1(b+6)=0
(b-1) (b+6)=0
b=1,-6
For b=1
a=6
a+b=7
For b=-6
a=-1
a+b=-7
Similar questions