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agasfer [191]
3 years ago
10

The square of 9 less than a number is 3 less than the number. What is the number?

Mathematics
2 answers:
ludmilkaskok [199]3 years ago
5 0

Answer:

D. 7 or 12

Step-by-step explanation:

Just took it. Edg 2020. Hope this helps :)

alexdok [17]3 years ago
4 0

Answer:

7, 12

Step-by-step explanation:

( n-9)^2 = n-3

Foil the right

n^2 -18n +81 = n-3

Subtract n from each side

n^2 -19n +81 =-3

Add 3 to each side

n^2 -19n +84 = 0

Factor

What 2 numbers multiply to 84 and add to -19

-12*-7 = 84

-12+-7 = -19

( n-7) (n-12) =0

Using the zero product property

n-7 =0   n-12= 0

n=7  n=12

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In isosceles △ABC the segment BD (with D∈ AC ) is the median to the base AC . Find BD, if the perimeter of △ABC is 50m, and the
Morgarella [4.7K]

Let the equal sides of the isosceles Δ ABC be x.

Given that the perimeter of Δ ABC = 50m.

Therefore, 2x + AC = 50 --- (1)

It is also given that the perimeter of Δ ABD = 40m.

Therefore, x + BD + AD = 40

BD is the median of the Δ ABC. Therefore, D is the midpoint of AC.

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2x + 2BD + AC = 80

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We're going to go ahead and eliminate one answer out of the four. It <u>cannot be B</u> (the second answer) <em>because the graph is made of dotted lines. </em>

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Solid Lines = ≤ or ≥

Next, let's focus on the straight line on the graph.

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Since the shaded region is <em>below </em>the line,

the equation will be <u>y <  x - 4 </u>

We can now <u>eliminate </u>answer <u>A </u>

Since the second equation is y < - l x - 2 l

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This means <em><u>the answer is  C</u></em>

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Answer:

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