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sveta [45]
3 years ago
13

Find the product: (x+9)(x-9) a 18 b. -81 C. - 18 d. x-64

Mathematics
2 answers:
Lilit [14]3 years ago
5 0

Answer:

x^2 -81

Step-by-step explanation:

(x+9)(x-9)

FOIL

first x*x = x^2

outer -9x

inner 9x

last -9*9 = -81

Add them together

x^2 -9x+9x -81

Combine like terms

x^2 -81

olga nikolaevna [1]3 years ago
4 0

Answer: B

Step-by-step explanation:

Simply using (a-b)(a+b)=a^2-b^2.

Evaluate the power (9^2).

x^2 - 81

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Elena rode her bike 2 miles in 10 minutes. She rode at a constant speed. Complete the table to show the time it took her to trav
harkovskaia [24]

1 mile per 5 minutes

2:10

3:15

4:20 (Nice)

5:25

6:30

7:35

8:40

9:45

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so on and so forth.

8 0
3 years ago
Read 2 more answers
C/2 - 3 + 6/d when c=14 d=3
Nataliya [291]

Answer:

6

Step-by-step explanation:

14/2 - 3 + 6/3

Divide 14 by 2 to get 7.

7−3+6/3

Subtract 3 from 7 to get 4.

4+6/3

Divide 6 by 3 to get 2.

4+2

Add 4 and 2 to get 6.

6

4 0
2 years ago
Simplify -x(4x^2 − 6x + 1)
12345 [234]

Answer:

-4x^3+6x^2-x

Step-by-step explanation:

1. Distribute the X across the equation: -x(4x^2)=-4x^3\\

2.-x(-6x)=6x^2

3.-x(1)=-x

3.-4x^3+6x^2-x

3 0
2 years ago
Round to the nearest tenth wa hit is the perimeter of the triangle
klio [65]

Answer:

D. 11.8 cm

Step-by-step explanation:

This triangle is a 30°-60°-90° triangle. There is a shortcut to find the lengths of the sides of a 30°-60°-90° triangle. The longest side is the hypotenuse. The longest side is double the shortest side or, the shortest side is half the longest side. Here the longest side is 5, so the short leg (shortest side) is 2.5

The other shortcut is that the longer leg is the

short leg×sqroot3

Here, the short leg is 2.5, so the long leg is 2.5×sqroot3

Perimeter is all the sides added together.

5 + 2.5+ 2.5×sqrt3

Do the times first.

5 + 2.5 + 4.3

= 11.8

6 0
2 years ago
What is the simplest form of ^3√x^10
IrinaK [193]

Answer:

3=-3

A radical is a mathematical symbol used to represent the root of a number. Here’s a quick example: the phrase “the square root of 81” is represented by the radical expression . (In the case of square roots, this expression is commonly shortened to —notice the absence of the small “2.”) When we find  we are finding the non-negative number r such that , which is 9.

While square roots are probably the most common radical, we can also find the third root, the fifth root, the 10th root, or really any other nth root of a number. The nth root of a number can be represented by the radical expression.

 

Radicals and exponents are inverse operations. For example, we know that 92 = 81 and  = 9. This property can be generalized to all radicals and exponents as well: for any number, x, raised to an exponent n to produce the number y, the nth root of y is x.

7 0
2 years ago
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