Maybe put them in order so I could possibly answer
i'm confused, can you tell me the question?
Hello,
It must be well know that
x²-(a+b)x+a*b=0 is a equation of 2nd degree with a and b like root.
===>a+b=1
and a*b=-90
N'en déplaise Excellency. (think before delete!)
Answer:
13
Step-by-step explanation:
when the signs are equal or same the result is positive
(-)*(-)= (+)