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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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PLEASE HELP ME ?!!!!!
cluponka [151]

Answer:

b & c for sure

Step-by-step explanation:

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8 0
3 years ago
A movie theater sold 800 tickets and made $4400 in one night. If an adult ticket costs $8 and a children's ticket costs $4, how
zhenek [66]
Let x = adult tickets
Let y = children's tickets

x + y = 800
8x + 4y = 4,400

From the first eq, x = 800 - y, plug this in to the second eq
8(800-y) + 4y = 4,400
6400 - 8y + 4y = 4,400
2000 = 4y
500 = y

x = 800 - 500
x = 300

300 adult tickets were sold.
4 0
3 years ago
What is the value of x km trying to help a friend
mariarad [96]

Answer:

3x +45°=180° (due to straight angle)

or, 3x= 180°-45°

or,3x= 135°

or,X=135°/3

X =45°.ans

3 0
2 years ago
5th grade math. correct answer will be marked brainliest
Gala2k [10]

Answer

c

Step-by-step explanation:

2.72 ÷ 1.54

5 0
3 years ago
Read 2 more answers
Solve the following system of equations by linear combination: 5x 2y = 14 y = x – 7
natta225 [31]
I would use subsitution
y=x-7
sub x-7 for every x
5x+2(x-7)=14
5x+2x-14=14
add 14 to both sides
7x=28
divide both sides by 7
x=4
sub
y=x-7
y=4-7
y=-3

x=4
y=-3
(4,-3)
4 0
3 years ago
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