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3 years ago

2xsquared - 72= 0 Solve the equation?

Mathematics

2 answers:

34kurt3 years ago

4 0

Answer:

-68

Step-by-step explanation:

Dafna11 [192]3 years ago

3 0

Answer:

x = -6 or x = 6

Step-by-step explanation:

2x^2 - 72 = 0

Divide both sides by 2.

x^2 - 36 = 0

Factor the left side. It is a difference of two squares. The pattern for that is

a^2 - b^2 = (a + b)(a - b). Now we apply that pattern to x^2 - 36 on the left side.

(x + 6)(x - 6) = 0

x + 6 = 0 or x - 6 = 0

x = -6 or x = 6

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Which table of values represents a linear function?

e-lub [12.9K]

Answer:

I don't know it's very hart

8 0

2 years ago

Traveling with the current, a boat covers a distance 1.5 times greater than traveling against the current in the same amount of

jeka94

Let the speed of the current equal c
and the speed of the boat in still water equal b.

b + c = 1.5 (b - c)
b + c = 1.5b - 1.5c
0.5b = 2.5c
b = 5c

The speed of the current is 1.5 mph so
b = 5 * 1.5 = 7.5 mph

4 0

3 years ago

A 100-foot rope from the top of a tree house to the ground forms a 45∘ angle of elevation from the ground. How high is the top o

DochEvi [55]

Answer:

The height of tree house is 70.71 feet

Step-by-step explanation:

We are given that A 100-foot rope from the top of a tree house to the ground forms a 45∘ angle of elevation from the ground

Refer the attached figure

Length of rope AC = Hypotenuse =100 feet

The top of a tree house to the ground forms a 45∘ angle of elevation from the ground = $\angle ACB = 45^{\circ}$

We are supposed to find the height of tree house i.e.AB = Perpendicular

So, Using trigonometric ratio

$Sin \theta = \frac{perpendicular}{Hypotenuse}\\Sin 45= \frac{AB}{AC}\\\frac{1}{\sqrt{2}}=\frac{AB}{100}\\100 \times \frac{1}{\sqrt{2}}=AB\\70.71=AB$

Hence The height of tree house is 70.71 feet

8 0

3 years ago

Do you know what the answer is to this question

RUDIKE [14]

Use subsiution]
y=-3x+5
subsitute -3x+5 for y in second equation
5x-4(-3x+5)=-3
distribute
5x+12x-20=-3
add like terms
17x-20=-3
add 20 to both sides
17x=17
divide both sides by 17
x=1
now subsitute 1 for x
y=-3x+5
y=-3(1)+5
y=-3+5
y=2

x=1
y=2

4 0

3 years ago

Multiple to list the next five multiples of 3

brilliants [131]

Answer:

6, 9, 12, 15, 18

Step-by-step explanation:

Finding multiples is simple, count by 3 for as many times as you can and there are your multiples.

7 0

2 years ago