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Ivan
3 years ago
5

What are the zeros of the function? f(x) = 8x2 + 2x – 21

Mathematics
2 answers:
Naddika [18.5K]3 years ago
4 0
X= 3/2 and -7/4
Factored is: (2x-3)(4x+7) you can find zeros by setting each of them to zero
amid [387]3 years ago
3 0

Answer:

x=\frac{3}{2} and x=-\frac{7}{4}

Step-by-step explanation:

Since, the zeroes are the input values in which the value of a function is zero,

Here, the given function,

f(x)=8x^2+2x-21

For zeroes,

f(x) = 0

\implies 8x^2 + 2x - 21 =0

By middle term splitting,

8x^2 + 14x - 12x - 21=0

2x(4x+7) - 3(4x+7)=0

(2x-3)(4x+7)=0

By zero product property,

2x - 3 = 0 or 4x + 7 = 0

⇒ x = 3/2 or x = -7/4

Hence, the zeroes of the given equation are x=\frac{3}{2} and x=-\frac{7}{4}

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6 0
3 years ago
Determine the value of x. Write the answer in an inequity. Use x only once in the inequality
Romashka-Z-Leto [24]

Answer:  1 < x < 25

<u>Step-by-step explanation:</u>

The sum of two sides must be GREATER than the third side.

      a +  b > c              a + c > b              b + c > a

     12 + 13 > x             12 + x > 13            13 + x > 12

          25  > x                     x > 1                      x > -1

           x < 25                     1 < x

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We are left with   1 < x  and   x < 25  

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4 0
3 years ago
Scott took out a 4-year car loan for $5,500. He paid back a total of $7,370. What interest rate did he pay for this loan?
elena-14-01-66 [18.8K]
Amount of car loan taken by Scott = $5500
Amount of loan paid back by Scott = $7370
Then
Amount of money paid as interest by Scott = (7370 - 5500) dollars
                                                                     = 1870 dollars
Then
Percentage of interest given for the car loan = (1870/5500) * 100
                                                                       = 1870/55
                                                                       = 34 percent
So Scott had to pay a total interest rate of 34% in the four years.I hope the procedure is simple enough for you to understand and solve future problems.
7 0
3 years ago
Is (3,7) A solution why or why not?
galben [10]
What? Can you attach a photo?
6 0
2 years ago
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1/4 of the students have a B, so there are 12 people in the class so what you would do is divide 12 by 4 and get an answer of 3 so 3 people got a B
6 0
3 years ago
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