cho phương trình 2x^2-5x-9 có hai nghiệm là x1,x2. không giải phương trình, hãy tính giá trị của biểu thức A= x1^2+x2^2-2x1x2^2
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Answer:
I honestly was having the worst time trying to solve this sorry :(, for real idk if any of these are right
i got 2 answers; 1st: ≈0.5 mph
the 2nd; 2 mph
Step-by-step explanation:
Speed =
2/3 miles = 3520 feet
1/3 hours = 20 minutes
------Make a proportion-----
cross multiply------
3520 * 60 = 211200
5280 * 20 = 105600
Divide
---(this is where i got confused cuz 2 doesn't make any sense)--
If you flip them, which makes more sense
hope i helped :(