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Anna35 [415]
3 years ago
8

Factor the trinomial. x^2-4x-5

Mathematics
1 answer:
Morgarella [4.7K]3 years ago
7 0
<h3>Answer: Choice C.  (x+1)(x-5)</h3>

We need to find two numbers that

  • Multiply to -5 (last term)
  • Add to -4 (middle coefficient)

Through trial and error, those two numbers are 1 and -5

  • 1 times -5 = -5
  • 1 plus -5 = -4

So this means x^2-4x-5 factors to (x+1)(x-5)

This is the same as (x-5)(x+1) since the order of multiplication doesn't matter.

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Michelle found the area of a circle as 78.5 . She used 3.14 for π. What is the radius of the circle? Explain how you found your
NikAS [45]

Answer:

5 units

Step-by-step explanation:

Given:-

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Find:-

What is the radius of the circle?

Solution:-

- The area of a circle (A) with radius ( r ) is computed by the following formula:

                            A = π*r^2

- Divide the equation by π :

                            r^2 = ( A / π )

- Take the square root of the entire equation:

                            r = √ ( A / π )

- Substitute the given values:

                           r = √ ( 78.5 / 3.14 )

- Resolve the fraction:

                          r = √25

- The perfect square root of 25

                         r = 5

Answer: The radius of the circle is r = 5 units

                         

3 0
3 years ago
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Answer:

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since it says "product of 5 and x" we know that 5 and x is being multiplied

5x

since it says 20 less than we know that we need to subtract 20 from 5x

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Step-by-step explanation:

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