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Serjik [45]
3 years ago
9

Factor completely 49x^2 − 9.

Mathematics
2 answers:
Mashcka [7]3 years ago
7 0

Answer:

A

Step-by-step explanation:

nikitadnepr [17]3 years ago
6 0

Step-by-step explanation:

49x²-9

(7x)²-(3)²

(7x+3)(7x-3)

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Solve the equation in the interval 0 to 2pi.
galben [10]

Answer:

You don't need to single out \cos \theta to solve this question.  

To solve:

\begin{aligned}3 \cos 4 \theta & = -2\\\\\cos 4 \theta & = -\dfrac{2}{3}\\\\4 \theta & = \cos^{-1}\left( -\dfrac{2}{3\right)}\\\\\implies 4 \theta & =2.30053... \pm 2 \pi n, -2.30053...\pm 2 \pi n\\\\\theta & =\dfrac{2.30053...}{4} \pm \dfrac{\pi n}{2}, -\dfrac{2.30053...}{4}\pm \dfrac{\pi n}{2}\end{aligned}

So for the given interval 0\leq \theta \leq 2 \pi

\implies \theta =0.575, 2.146, 3.717, 5.288, 0.996, 2.566, 4.137, 5.708\:\:(\sf 3 \: d.p.)

(As confirmed by the attached graph)

5 0
2 years ago
Read 2 more answers
What is the first significant figure of 13822?
deff fn [24]

Answer:

1

Step-by-step explanation:

The rules for significant figures are:

  • Non-zero digits are always significant.
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  • Trailing zeros are significant only after a decimal point.

In 13822, all of the digits are non-zero.  So the first significant figure is 1.

3 0
3 years ago
Help me please - ?! :C
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The slope is 2.

Equation if needed: y= 2x + 1

5 0
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I need help plsssssssss
Georgia [21]

Answer:

i dont know sorry

Step-by-step explanation:

6 0
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