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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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Answer:

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2. 3/2 egg =1.5 eggs

3. 33g of flour=1/3 pinch of salt

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33g of flour=100ml of milk

4. 24 servings

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Step-by-step explanation:

12 servings

Plain flour=100g

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Oil= 1 tbsp

Egg=1

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1. Pinches of salt in 24 servings

24

12 servings=1 pinch of salt

24 servings=24/12*1 pinch of salt

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=2 pinch of salt

2. Egg needed for 18 servings

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18 servings=18/12 * 1 egg

=3/2* 1 egg

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3. If there are 33 grams of flour,

The other ingredients will be

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The other ingredients will be 1/3 of the original measurement

Salt=a pinch

33g of flour=1/3 pinch of salt

Oil= 1 tbsp

33g of flour=1/3 tbsp of oil

Egg=1

33g of flour=1/3 egg

Milk=300 ml

33g of flour=1/3 of 300ml

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=100ml of milk

4. If two eggs were used, grams of flour needed is

1 egg =12 servings

2 eggs=2* 12 servings

=24 servings

5. Flour needed if 900ml milk is used

100g flour=300ml of milk

900ml of milk=300ml * 3

Therefore,

900ml of milk=100g of flour *3

900ml of milk=300g of flour

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