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heatwave9856
22.02.2021 •
Mathematics
Which factor could be multiplied by the given function so that their product causes the graph of f(x) to decrease as x approaches negative infinity?
![f(x)=(2x^2 + 5)(x - 7)](/tpl/images/2166/9499/d94fa.png)
Select all that apply.
• -3
• 0.2x
• 5x²
• ![-\frac{1}{2}(x + 8)](/tpl/images/2166/9499/eb971.png)
• 4(2x - 7)
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Ответ:
3rd and 4th Choices.
Step-by-step explanation:
We are given the function:
And we want to determine the factor(s) that we can multiply to the above function that will cause the graph of f to decrease as x approaches negative infinity.
We can see that the dominant term will be:
Thus:
It is already decreasing (shifting towards negative infinity) as x approaches negative infinity.
In order to preserve this, then, the factors must be positive as x approaches negative infinity.
The first factor is -3.
-3 is always negative, so it will make f increase.
The second factor is
.
This will also make f increase.
The third factor is:
This is positive, so it will allow f to remain decreasing as x approaches negative infinity.
The fourth factor is:
This is also positive, so it will also allow f to remain decreasing.
Lastly, the fifth factor is:
This is negative, so it will make f increasing.
Therefore, our answers are the third and fourth choices.
Ответ:
10×8.5+6×8.5+8.5×8+(6×8/2)×2
=85+51+68+48
=252 sq.units
Thus the answer is 252 sq.units
Hope it helps!