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Tomtit [17]
3 years ago
15

Démontrer que x²-4x+5=(x-2)²+1 ; En déduire que x²-4x+5=0 n'a pas de solution

Mathematics
1 answer:
iragen [17]3 years ago
8 0
1st: toute valeur de x rend I'<span>équation vraie
tous les nombres r</span><span>éels

2nd: r</span><span>ésoudre l'équation pour x en trouvant a, b et c du quadratique puis en appliquant la formule quadratique
x = 2 ± i</span>
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RideAnS [48]

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l think that the answer is (-3,2). pliz can you mark me the brainest.

7 0
3 years ago
Yallll please help me its my next period and its missing.​
jeka57 [31]

Answer:

<em>#6: -1/5     #7: 2/3</em>

Step-by-step explanation:

#6:

(5,7) and (25,3)

3-7/ 25-5 = -1/5

#7:

( 6,4) and (12,8)

8-4/ 12-6 = 2/3

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5 0
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Renting video games from Store A costs $3.50 per game plus a monthly fee of $7.50. Renting video games from Store B costs $5.00
Burka [1]

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Step-by-step explanation:

5 0
3 years ago
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The population of mosquitoes in a certain area increases at a rate proportional to the current population, and in the absence of
Nesterboy [21]

Answer:

P=400000(2^t)-40000t

Step-by-step explanation:

The initial number of mosquitoes is 400000, and they double each day. This represents an exponential growth equation. If t represent days and P represent the population of the mosquitoes, hence this can be represented by the equation:

P=400000(2^t)

Also, the predators eat the mosquitoes at a rate of 40,000 mosquitoes/day. This means that each day, the mosquitoes reduce by 40000t, therefore this can be represented by:

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8 0
3 years ago
The table shows the number of cups of water required when cooking different amounts of rice. Amount of Rice (cups) Amount of Wat
Ugo [173]
<span>Amount of Rice (cups) Amount of Water (cups)
2                                     5
3                                     7.5
5                                   12.5
8                                   20

Let's find the ratio of rice and water:

5 / 2 = 2.5 => 2 * 5 = 5

7.5 / 3 = 2.5 => 3 * 2.5 = 7

12.5 / 5 = 2.5 => 5 * 2.5 = 12.5

20 / 8 = 2.5 => 8 * 2.5 = 20

So, as the ratio of water ot rice is constant, and the first variable is the amount of rice, you can calculate the amount of water given the amount of rice.

So, the amount of rice is independent value and the amount of water is dependent (it depends on the amount of rice).

The amount of rice is the dependent value. FALSE
The amount of water is the dependent value.TRUE
The amount of rice is the independent value. TRUE
The amount of water is the independent value.</span>FALSE
7 0
3 years ago
Read 2 more answers
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