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3 years ago

What is the expression in factored form? 9x^2-4 show all work

Mathematics

1 answer:

ziro4ka [17]3 years ago

7 0

Answer:

$(3x+2)(3x-2)$

Step-by-step explanation:

we know that

A binomial is a Difference of Squares if both terms are perfect squares

we have

$9x^{2} -4$

$9x^{2}=(3x)^{2}$ ---> is a perfect square

$4=(2)^2$ ----> is a perfect square

Both terms are perfect squares

The difference of squares is

$9x^{2} -4=(3x+2)(3x-2)$ ----> by difference of squares

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What is the equation of the line in slope-intercept form?

belka [17]

Answer:

y = 3/5 x+3

Step-by-step explanation:

two points on the graph

(-5,0) (0,3)

the y intercept is 3 (this is where it crosses the y axis)

the slope is

change in y 0 to 3 up 3

------------------ = -------------- = ------- = 3/5

change in x -5 to 0 right 5

we can tell the slope is positive because it goes from bottom left to top right

a negative slope goes from top left to bottom right

slope intercept form is

y=mx+b

y = 3/5 x+3

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4 years ago

Read 2 more answers

$4 is what percent of $50

Misha Larkins [42]

To find the answer you do 4/50 which gives you 0.08. You multiply this by 100 and you have 8%

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3 years ago

I WILL GIVE BRAINLIEST IF CORRECT !!!!

rosijanka [135]

Answer:

C. $3.2\times 10^{1}$

Step-by-step explanation:

$d_r$ = Diameter of a red blood cell = $0.0008\ \text{cm}$

$d_w$ = Diameter of a whooping cough virus = $2.5\times 10^{-5}\ \text{cm}$

Ratio of the diameter of the red blood cell to the diameter of the whooping cough virus

$\dfrac{d_r}{d_w}=\dfrac{0.0008}{2.5\times 10^{-5}}=\dfrac{0.0008}{25\times 10^{-6}}=\dfrac{0.0008\times 10^6}{25}\\\Rightarrow \dfrac{d_r}{d_w}=\dfrac{800}{25}\\\Rightarrow \dfrac{d_r}{d_w}=32=3.2\times 10^{1}$

The required ratio is $3.2\times 10^{1}$ .

4 0

3 years ago

I WILL GIVE BRAINLIEST, 5 STARS AND THANKS!!! When an inequality models a practical problem, why might some of the points on the

kramer

Answer:

An inequality often covers an infinite area. Depending on the problem, any area either below or above the function is included in the set of solutions.

For example, see the attached photo.

y < x is graphed here.

When you substitute x = 0 into the function, y will equal 0 and this point is a solution to the problem. However, if any point under this line, such as (1, 0), (-9, 0), or even (1000000000, 0), was chosen, these are still solutions to the inequality, but not the problem.

Step-by-step explanation:

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3 years ago

Solve the equation 5 + 1/7(b) = -2 b=?

Ganezh [65]

Answer:

Step-by-step explanation:

$5+ \frac{1}{7}b=-2b$

3 0

4 years ago