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3 years ago

What is (x+2)(x-2) equal ?

Mathematics

2 answers:

belka [17]3 years ago

8 0

Answer:

x^2 - 4

Step-by-step explanation:

since it is in the form of

a^2 - b^2 = (a + b)(a - b)

u can directly write x^2 - 2^2

=x^2 - 4

process :

(x + 2)(x - 2)

=x(x - 2) + 2(x - 2)

=x^2 - 2x + 2x - 4

=-2x and plus 2x gets cancel

=x^2 - 4

gizmo_the_mogwai [7]3 years ago

7 0

(x - 4)^2 , i hope this helps

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Find the slope given the two points. (2, -6) and (2, 3)

kifflom [539]

Answer: Undefined

The x coordinates are the same, so a vertical line forms. All vertical lines have undefined slopes.

We can see it through the slope formula

m = (y2-y1)/(x2-x1)

m = (3-(-6))/(2-2)

m = (3+6)/(2-2)

m = 9/0

We cannot divide by zero, so the result is undefined.

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3 years ago

Read 2 more answers

Please help with this

julsineya [31]

Here's the work and the answer. I hope this helps.

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3 years ago

An aircraft factory manufactures airplane engines. The unit cost C (the cost in dollars to make each airplane engine) depends on

butalik [34]

Answer:

90 engines must be made to minimize the unit cost.

Step-by-step explanation:

Vertex of a quadratic function:

Suppose we have a quadratic function in the following format:

$f(x) = ax^{2} + bx + c$

It's vertex is the point $(x_{v}, y_{v})$

In which

$x_{v} = -\frac{b}{2a}$

$y_{v} = -\frac{\Delta}{4a}$

Where

$\Delta = b^2-4ac$

If a>0, the minimum value of the function will happen for $x = x_v$

C(x)=x²-180x+20,482

This means that $a = 1, b = -180, c = 20482$

How many engines must be made to minimize the unit cost?

x value of the vertex. So

$x_{v} = -\frac{b}{2a} = -\frac{-180}{2(1)} = 90$

90 engines must be made to minimize the unit cost.

3 0

3 years ago

2/9 divided by 5/6<br>help pleaseee

igomit [66]

Hey there!

$\mathsf{\dfrac{2}{9}\div\dfrac{5}{6}}$

$\mathsf{= \dfrac{2\times6}{9\times5}}$

$\mathsf{2\times 6 = \bf 12}$

$\mathsf{9\times5 = \bf 45}$

$\boxed{\mathsf{=\bf \dfrac{12}{45}}}$

$\large\textsf{BOTH NUMBERS has the Greatest Common Factor (GCF) of 3}$

$\mathsf{= \dfrac{12\div3}{45\div3}}$

$\mathsf{12\div3=\bf 4}$

$\mathsf{45\div3=\bf 15}$

$\boxed{\mathsf{=\bf \dfrac{4}{15}}}$

$\boxed{\boxed{\large\textsf{Answer: }\mathsf{\bf \dfrac{4}{15}}}}\huge\checkmark$

$\large\textsf{Good luck on your assignment and enjoy your day!}\\\\\\~\frak{Amphitrite1040:)}}$

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3 years ago

What is the value of x?

Marysya12 [62]

A triangle always adds up to 180 degrees:

Therefore, 48 + 6x + 9x-3 = 180

Solve for x:

180 - 45 = 15x
135 = 15x

x = 9 degrees

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3 years ago