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1 year ago

PLSSSS HELPPP 18 POINTS MATHHH PLSSS HELPPP

Mathematics

2 answers:

notsponge [240]1 year ago

8 0

Answer:

$\sf \bf 81x^8$

Step-by-step explanation:

<h3>Exponent rule:</h3>

In exponent multiplication, if bases are same, add the exponents.

$\sf \bf a^m*a^n = a^{m+n}$

$\sf (-9x^5)(-9x^3) = (-9)*(-9) * x^{5+3}$

$\sf = 81x^8$

DiKsa [7]1 year ago

3 0

Answer:

$81x^{8}$

Step-by-step explanation:

I gotchu again, papiii!! :D

This is an easy one too! Theres a couple rules you should be familair with:

A positive multiplied by a positive is a positive.
A positive multiplied by a negative is a negative.
A negative multiplied by a negative is a positive.

Furthermore, when you have a problem in this form, you MULTIPLY the coefficients and ADD the exponents. So, -9 * -9 = POSITIVE 81, and $x^{5+3}=x^8$ . Therefore, the answer is $81x^{8}$

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Check the picture below.

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2 years ago

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3 years ago

What method would you choose to solve the equation 2x2 – 7 = 9? Explain why you chose this method.

Kisachek [45]

<span>This is a quadratic equation . We order to equate to zero

</span>2x²<span> – 7 = 9
</span>
2x² - 7-9 = 0
2x² - 16 = 0

This equation is a binomial
2* (x² - 8) = 0
<span>We choose the simplest method . The equation with practice it can be calculated in the memory
</span><span>
The product is equal to 0 if one of the factors is zero
</span>
2≠0 ∨ x² - 8 = 0
x² = √8
x = √8 ∨ x= - √8

Answer : x = √8 ∨ x = -√8

5 0

2 years ago

Read 2 more answers

Which trigonometric function has a range that does not include 0.4?

Montano1993 [528]

<h2>Hello!</h2>

The answer is: $y=cscx$

Domain and range of trigonometric functions are already calculated, so let's discard one by one in order to find the correct answer.

The range is where the function can exist in the vertical axis when we assign values to the variable.

First:

$y=cosx$ : Incorrect, it does include 0.4 since the cosine range goes from -1 to 1 (-1 ≤ y ≤ 1)

Second:

$y=cotx$ : Incorrect, it also does include 0.4 since the cotangent range goes from is all the real numbers.

Third:

$y=cscx$ : Correct, the cosecant function is all the real numbers without the numbers included between -1 and 1 (y≤-1 or y≥1).

Fourth:

$y=sinx$ : Incorrect, the sine function range is equal to the cosine function range (-1 ≤ y ≤ 1).

I attached a pic of the csc function graphic where you can verify the answer!

Have a nice day!

8 0

3 years ago