Eduardo thinks of a number between 1 and 20 that has exactly 5 factors.What number is he thinking of?
1 answer:
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Answer:
Step-by-step explanation:
Here we are given that a polynomial has zeros as 2 , i and -i . We need to find out the cubic polynomial . In general we know that if are the zeros of the cubic polynomial , then ,
Here in place of the Greek letters , substitute 2,i and -i , we get ,
Now multiply (x-i) and (x+i ) using the identity (a+b)(a-b)=a² - b² , we have ,
Simplify using i = √-1 ,
Multiply by distribution ,
Simplify by opening the brackets ,
Rearrange ,
Answer:
Step-by-step explanation:
<u>Step 1: Set y to 15 and solve</u>
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<em>Add 10 to both sides</em>
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<em>Multiply both sides by 5</em>
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Answer: