What are the real roots of 2x^3-42x-40
1 answer:
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Answer:
The solution is the table 1 (see the attached figure)
Step-by-step explanation:
we know tat
Table 1
In the interval (-2.-1) -----> increase
In the interval (-1.1) -----> decrease
In the interval (1,2) -----> increase
Table 2
In the interval (-2.2) -----> decrease
Table 3
In the interval (-2.-1) -----> decrease
In the interval (-1.1) -----> increase
In the interval (1,2) -----> decrease
Table 4
In the interval (-2.2) -----> increase
therefore
The solution is the Table 1
