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taurus [48]
3 years ago
9

What is the discriminant and the roots of 2x² - 10x + 8 = 0?​

Mathematics
2 answers:
Darina [25.2K]3 years ago
8 0

Answer:

D=36, x1=1, x2=4

Step-by-step explanation:

Find the D:

D = b2 - 4ac = (-10)2 - 4·2·8 = 100 - 64 = 36

Since the discriminant is greater than zero, the quadratic equation has two real roots

x1=\frac{10-\sqrt{36} }{2*2} \\x2=\frac{10+\sqrt{36} }{2*2}

Verizon [17]3 years ago
6 0

Discriminant = b^2 - 4ac

= 36

Roots:

Method: Sum and Product

Sum = -10

Product = 16

(2x^2 - 8x) - (2x + 8) = 0

2x(x - 4) - (x - 4) = 0

x = 0 or x = 4

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The function h(t)=-4.92t^2+17.69t+575 is used to model an object being tossed from a tall building, where h(t) is the height in
nikklg [1K]
We have the following equation:
<span> h(t)=-4.92t^2+17.69t+575

</span> For the domain we have:
<span> </span>We match zero:
 -4.92t ^ 2 + 17.69t + 575 = 0
 We look for the roots:
 t1 = -9.16
 t2 = 12.76
 We are left with the positive root, so the domain is:
 [0, 12.76]

 For the range we have:
 We derive the function:
 h '(t) = - 9.84t + 17.69
 We equal zero and clear t:
 -9.84t + 17.69 = 0
 t = 17.69 / 9.84
 t = 1.80
 We evaluate the time in which it reaches the maximum height in the function:
 h (1.80) = - 4.92 * (1.80) ^ 2 + 17.69 * (1.80) +575
 h (1.80) = 590.90
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 [0, 590.9]

 Answer:
 the domain and range are:
 
domain: [0, 12.76] range: [0, 590.9]
5 0
3 years ago
Read 2 more answers
What is the best estimate for the sum 2/9 + 10/11 ?
Gelneren [198K]

Answer:

4. 0 + 1 = 1

Step-by-step explanation:

since 2/9 is a bit small

and

since 10/11 is almost whole

3 0
3 years ago
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The length of a rectangle is 4x + 5 and the width is 8x - 4. what is the perimtleter?
Luda [366]
Hi there!

Since the formula for finding the perimeter of a rectangle is length×2 + width × 2, we can follow this rule.

2 (4x + 5) + 2 (8x - 4)
= 8x + 10 + 16x - 8
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So, the perimeter is 24x + 2.

Hope this helps!
5 0
3 years ago
Does anyone know this?
rosijanka [135]

Answer:

-6

Step-by-step explanation:

Hello!

Since we are finding f(-1) we put -1 in for x

2(-1)^2 + 8(-1)

Follow PEMDAS

2 * 1 + 8(-1)

2 * 1 + -8

2 + -8 = -6

The answer is -6

Hope this helps!

7 0
3 years ago
The total price of a shirt and a cap is $11. If the price of the shirt was doubled and the price of the cap was three times its
shusha [124]

Answer:

the shirt is 8 dollars and the cap is 3

Step-by-step explanation:

This is because 8 times 2 is 16 which is the new price of the shirt then 3 times 3 is 9 which would be the new cap price and 16 plus 9 is 25

4 0
2 years ago
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