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SVETLANKA909090 [29]
3 years ago
5

HELP! Match the range of the function f(x)=x^2+2x-1 to its domain

Mathematics
1 answer:
Ksenya-84 [330]3 years ago
4 0
If f(x)=x^2 +2x -1
a) 2=x^2+2x-1
0=x^2+2x-3
0=(x+3)(x-1)  x=-3 or 1

b) 14=x^2+2x-1
0=x^2+2x-15
0=(x+5)(x-3) x=-5 or 3

c) 7=x^2+2x-1
0=x^2+2x-8
0=(x+4)(x-2) x=-4 or 2

d) -1=x^2+2x-1
0=x^2+2x+0
0=(x+2)x  x=0 or -2

Since this function involves a quadratic equation, there are technically two possible inputs that will give you the same output. In your case, you just have to match one of the possible inputs to its output (the numbers on the left originally given, from what it seems.) Hope this helps

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What is the answer to this problem?
zepelin [54]

Answer:

36

Step-by-step explanation:

You subtract 180 from 56 then add your answer, 124 to 20, then subtract 144 from 180 to get 36

6 0
3 years ago
20% of city employees ride the bus to work. This is up 10% from last year. What percent of employees rode the bus to work last y
Pepsi [2]

Answer:

18.18% of employees rode the bus to work last year

Step-by-step explanation:

This question can be solved using a rule of three.

Last year, a proportion of x employees riding the bus was 100% = 1.

This year, 20% = 0.2 ride the bus, which is 100 + 10 = 110% = 1.1 of last year.

So

0.2 - 1.1

x - 1

1.1x = 0.2

x = \frac{0.2}{1.1}

x = 0.1818

0.1818*100 = 18.18%

18.18% of employees rode the bus to work last year

4 0
3 years ago
Need help anyone who can help plz
olasank [31]

Answer:

A) x=40°

B) They have the same lengths.

Step-by-step explanation:

Since it is an isosceles triangle, both sides are the same. So if you add up all the angles of any triangle, it should always add up to 180°. There is a 50° angle and a right angle (90°) so you subtract 50 and 90 from 180 (180-50-90) and you get 40. X has to be 40° :)

6 0
3 years ago
Select the correct answer.<br> Which function is the inverse of f(x) = -x^3 - 9?
joja [24]

Answer:

(2)

Step-by-step explanation:

Let f(x) = y → f-¹(x) = f(y) = x, f(y) is the inverse of f(x)

Thus,

=> -x³ - 9 = y

=> - y - 9 = x³

=> (-y - 9)^(1/3) = x

=> f(y) = x

Inverse is (-y-9)^(1/3)

Replacing the variable, inverse is (-x-9)^(1/3)

Option (2)

4 0
3 years ago
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lara [203]
Its E and answer its E
5 0
3 years ago
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