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3 years ago

Solve 3x>−21. The solution of the inequality is a .

Mathematics

2 answers:

sergiy2304 [10]3 years ago

8 0

Answer:

x >-7

Step-by-step explanation:

3x>−21.

Divide each side by 3

3x/3 >-21/3

x >-7

Alina [70]3 years ago

8 0

Answer:

x=-7

Step-by-step explanation:

Divide both sides by 3

3x/3=-21/3

x=-7

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Answer:

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Step-by-step explanation:

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$\cos x$ is continuous over its domain, so the intermediate value theorem tells us that

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For all $x$ , we take into account that $\cos x$ is $2\pi$ -periodic, so the above inequality can be expanded to

$-\dfrac\pi4\le x+2n\pi\le\dfrac\pi4$

where $n$ is any integer. Equivalently,

$-\dfrac\pi4-2n\pi\le x\le\dfrac\pi4-2n\pi$

To get the corresponding solution set for

$\cos\left(x+\dfrac\pi3\right)\ge\dfrac{\sqrt2}2$

simply replace $x$ with $x+\frac\pi3$ :

$-\dfrac\pi4-2n\pi\le x+\dfrac\pi3\le\dfrac\pi4-2n\pi$

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3 years ago

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Answer:

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Step-by-step explanation:

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3 years ago

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mafiozo [28]

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4 years ago

Read 2 more answers