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STALIN [3.7K]
3 years ago
5

Need help again, I really hate math please help​

Mathematics
1 answer:
hoa [83]3 years ago
3 0
C I think good luck
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What equation is graphed in this figure?
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Consider the function f(x)=-3x^2 +7x -k. [3 Marks] a) For what values of k will the function have no zeros? b) For what values o
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Answer: a) k >4.08

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Step-by-step explanation:

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f(x)=-3x^2+7x-k

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D

b) For what values of k will the function have one zero?

It means it has one real root i.e equal roots.

So, in this case, D = 0

So, it becomes,

D=b^2-4ac=0\\\\D=7^2-4\times -3\times -k=0\\\\49-12k=0\\\\49=12k\\\\k=\dfrac{49}{12}\\\\k=4.08

c) For what values of k will the function have two zeros?

It means it has two real roots.

In this case, D>0

So, it becomes,

D=7^2-4\times -3\times -k>0\\\\49-12k>0\\\\-12k>-49\\\\12k

Hence, a) k >4.08

b) k = 4.08

c) k<4.08

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3 years ago
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