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Cloud [144]
3 years ago
15

(Brainliest for fastest right answer!!!) Which is correct?

Mathematics
1 answer:
zavuch27 [327]3 years ago
5 0

Answer:

Step-by-step explanation:

ax² + bx + c = a(x - x_{1})(x - x_{2})

D = b² - 4ac

x_{12} = ( - b ± √D ) / 2a

~~~~~~~~~~~~

Let x² = y , then y² + 8y - 9

Find the roots of equation y² + 8y - 9 = 0

D = 64 + 36 = 100 = 10²

y_{1} = ( - 8 - 10) / 2 = - 9  

y_{2} = ( - 8 + 10) / 2 = 1

y² + 8y - 9 = (y - 1)(y + 9) = (x² - 1)(x² + 9)

x² = 1 ⇒ x_{12} = ± √1

x^{4} + 8x² - 9 = (x - 1)(x + 1)(x² + 9)

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To eliminate the y-terms and solve for x in the fewest steps, by which constants should the equations be multiplied by before ad
Kryger [21]

Answer:

The first equation should be multiplied by 9 and the second equation by −4

Step-by-step explanation:

Given the simultaneous equation

First Equation: 5x − 4y = 28

Second equation: 3x - 9y = 30

In order to eliminate y, we must make the coefficient of x in both expression to be equal.

To do that the first equation should be multiplied by 9 (negative value of the coefficient of y in equation 2)and the second equation by -4( (coefficient of y in equation 1)

7 0
3 years ago
Can someone solve this for me?
Naya [18.7K]

Answer:

-1/2

Step-by-step explanation:

Slope is defined as change in x/change in y.

The x changed by 1/8-(-1/4)=3/8 and the y changed by -4-(-1/4)=(-3/4).

Now, divide the 2 fractions:

(-3/4)/3/8 = -3/4*8/3 = -4/8 = -1/2

5 0
3 years ago
A 40 amp fuse carries a temporary 9 % current overload. How many
ziro4ka [17]

Answer:

43.6 amp

Step-by-step explanation:

Given

A 40 amp fuse carries a temporary 9 % current overload.

9% current overload means that whatever will be the normal current carrying capacity of fuse, during overload it carries 9% more than that.

Current carrying capacity of fuse is 40 amp.

during overload it carries 9% more

over load current = 9% of 40 amp  = 9/100 *40 = 3.6 amp

total current flowing through fuse during overload = 40 amp + 3.6 amp

                                           = 43.6 amp (answer)

7 0
3 years ago
Fred spent half of his allowance going to the movies. He washed the family
Lostsunrise [7]

Answer:

16

Step-by-step explanation:

17-9 = 8

8x2 = 16

assuming him washing his car isn't part of the allowance

4 0
3 years ago
Can u help me with this question please
Levart [38]
The graph is linear because it is a straight line with a constant slope. Can u mark me brainliest, thank, rate 5 stars and have a good day!
5 0
3 years ago
Read 2 more answers
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