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lidiya [134]
2 years ago
10

Find the values of​ a, b, and c for which the quadratic equation ax^2 + bx + c = 0 has the solutions 8i and −8i.

Mathematics
1 answer:
ozzi2 years ago
4 0
Work backward:  Multiply out (x-8i) and (x+8i).

The product is x^2 - [64i^2], or x^2 - [-64], or x^2 + 64

This is equivalent to 1x^2 + 0x + 64, and so a=1, b=0 and c=64.
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Answer:

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3 0
2 years ago
A store has apples on sale for $5.00 for 2 pounds. If an apple is approximately 5 ounces, how many apples can you buy for $30.00
jeyben [28]
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8 0
3 years ago
To compare two products such as colas, a random sample is selected to taste two types of colas (A and B). Each selected subject
Nadya [2.5K]

Answer: The sample size would be needed = 385

Step-by-step explanation:

Let p be the prior population proportion.

Margin of error = E

When not estimate of p is given , the formula to calculate the minimum sample size <em>n</em> = 0.25(\dfrac{z^*}{E})^2 , where z* = critical value for given confidence interval.

Here z* for 95% confidence level is 1.96.

E=5%=0.05

Then n=0.25(\dfrac{1.96}{0.05})^2\approx385

Hence, the sample size would be needed = 385

8 0
2 years ago
Y = -2x +7<br><br><br> y = 3/4x +3
bearhunter [10]
Making the two equations equal to each other
it gives a quadratic equation
i hope this helps


please mark as brainliest
6 0
3 years ago
Evaluate 5y+x2÷2 when x=4 and y=−3. When x=4 and y=−3, 5y+x2÷2=
Alex Ar [27]
The answer is 5 x -3 + 4 x 2 / 2 = -15 + 8 / 2 = -11
6 0
3 years ago
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