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4 years ago

Consider the steps for solving 3x2 – 42x + 9 = -5 for x by completing the square.

Mathematics

1 answer:

Karolina [17]4 years ago

3 0

The answer to this question will be C

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Steps to solve Tangent of 5π/4

seraphim [82]

Answer:

Step-by-step explanation:

Tangent of [5 pi]/4

The expression above is given in radian; when ever you have something like this- take note, it's in radian.

Pi [in radian] = 180 in degrees

Hence [5 pi]/4 = [5 x 180]/ 4 =5 x 45 = 225

So Tan 225 = Tan [225-180] =Tan 45

and Tan 45 =1

8 0

3 years ago

PLEASE HELP IM BEGGING YOU ILL GIVE BRAINLIUESTV AND PLESE HSWO WORK CUZ I DONT KNO WHO TO F THIS

tankabanditka [31]

Ok I will help you. This middle school?

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3 years ago

Express 0.4 as a percent

r-ruslan [8.4K]

The answer is 40%. You are welcome.

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3 years ago

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Round 5,438 to the nearest hundred

rodikova [14]

Answer:

5,400

Step-by-step explanation:

6 0

3 years ago

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Convert the following sum into a product. cosx + cos3x + cos5x + cos7x

kvv77 [185]

Answer:

$4\cos x\cos (4x)\cos (2x)$

Step-by-step explanation:

Given: $cosx + cos3x + cos5x + cos7x$

To convert: the given sum into product

Solution:

Use formula: $\cos A+\cos B=2\cos \left ( \frac{A+B}{2} \right )\cos \left ( \frac{A-B}{2} \right )$

$cosx + cos3x + cos5x + cos7x=2\cos \left ( \frac{x+3x}{2} \right )\cos \left ( \frac{x-3x}{2} \right )+2\cos \left ( \frac{5x+7x}{2} \right )\cos \left ( \frac{5x-7x}{2} \right )\\=2\cos (2x)\cos (-x)+2\cos (6x)\cos (-x)\\=2\cos (2x)\cos (x)+2\cos (6x)\cos (x)\\=2\cos x\left [ \cos (2x)+\cos (6x) \right ]$

$cosx + cos3x + cos5x + cos7x=2\cos \left ( \frac{x+3x}{2} \right )\cos \left ( \frac{x-3x}{2} \right )+2\cos \left ( \frac{5x+7x}{2} \right )\cos \left ( \frac{5x-7x}{2} \right )\\=2\cos x\left [ \cos (2x)+\cos (6x) \right ]\\=2\cos x\left [2 \cos \left ( \frac{2x+6x}{2} \right )\cos \left ( \frac{2x-6x}{2} \right ) \right ]\\=2\cos x\left [ 2\cos (4x) \cos (-2x) \right ]\\=4\cos x\cos (4x)\cos (2x)$

4 0

3 years ago