angeljohnson2081
08.05.2021 •
Mathematics
A scientist estimated that there are five hundred twenty billion grains of sand on a beach. How is that number written in scientific notation?
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Ответ:
Correct option is
A
1,−1/2
For equal roots D=b
2
−4ac=0
⇒[2(m+1)]
2
−4m(3m+1)=0
⇒m
2
+2m+1−3m
2
−m=0
⇒−2m
2
+m+1=0
⇒2m
2
−m−1=0⇒(m−1)(m+
2
1
)=0
⇒m=1,
2
−1