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IrinaVladis [17]
3 years ago
8

Complete the table by providing justification for each step of the proof

Mathematics
1 answer:
exis [7]3 years ago
5 0
4(x² - 2) = 28

1. Distribute the 4
4x² - 8 = -28

2. Plug in 3 and -3
4(3)² - 8 = 28
4(-3)² - 8 = 28

3. Square 3 and -3
4(9) - 8 = 28
4(9) - 8 = 28

28 = 28

The reason both answers are the same is because whenever you put a negative number to an even power, the result becomes positive because any negative multiplied by a negative number is always positive.
28 = 28
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A certain triangle has a 30 degree angle and a 60 degree angle. Which of the following must be a true statement about the triang
12345 [234]

we know that

If the triangle has a 30 degree angle and a 60 degree angle, then the third angle is a 90 degree angle

so

is a right triangle

Sin(30\°)=Cos(60\°)=\frac{1}{2}

Cos(30\°)=Sin(60\°)=\frac{\sqrt{3}}{2}

<u>Statements</u>

<u>A. The second-longest side is twice as long as the shortest side.</u>

we know that

the ratio between the second-longest side and the shortest side is

\frac{\sqrt{3}}{1}

therefore

the statement A is False

<u>B. The longest side is twice as long as the shortest side</u>

we know that

the ratio between the longest side and the shortest side is

\frac{2}{1}

therefore

the statement B is True

<u>C. Two sides of the triangle have the same length</u>

The statement C is False, because is not an isosceles triangle (45-90-45)

<u>D. The longest side is square root 3 times as long as the shorted side</u>

  we know that

the ratio between the longest side and the shortest side is

\frac{2}{1}

The longest side is twice as long as the shortest side

therefore

The statement case D is False

<u>the answer is the option</u>

B. The longest side is twice as long as the shortest side


5 0
3 years ago
Read 2 more answers
PLEASE HELP! <br> SOLVE { X+Y=4<br> {7X+9Y=42
swat32

Answer:

Step-by-step explanation:

x + y = 4  ---------------(i)

x = 4-y

7x + 9y = 42 -----------(ii)

Plug in x = 4-y in equ (ii)

           7*(4 - y) + 9y = 42

             28 - 7y +9y = 42

                   28 + 2y = 42

                           2y = 42 - 28

                           2y = 14

                            y = 14/2

y = 7

x = 4 - y

x = 4 - 7

x = -3

5 0
3 years ago
Read 2 more answers
Simplify -5-8x+4x-6+9x
MrRissso [65]
Okay.  First simplify all the like terms (all the coefficients and all the variables).
When simplified it should give you:
5x-11

6 0
4 years ago
Read 2 more answers
NEED HELP ASAP!!!
Kay [80]
A

sorry if its wrong looks reasonable
6 0
3 years ago
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