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Sladkaya [172]
3 years ago
13

Carlos borrowed $4000 from a lender that charged simple interest at an annual rate of 7%. When Carlos paid off the loan, he paid

$560 in interest. How
was the loan for, in years?
Mathematics
1 answer:
Tresset [83]3 years ago
7 0

Answer:

it was 2 years

Step-by-step explanation:

4000*7%= 280

280 for a year

280x=560

x= 2

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Answer:

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If a quadratic equation lx^2+mx+n=0 has one imaginary root as a+bi then the other root is the conjugate of a+bi = a-bi

Because we have l, m and n are real numbers and they are the coefficients.

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When -m/l is real because the ratio of two real numbers, left side also has to be real.

Since bi is one imaginary term already there other root should have -bi in it so that the sum becomes real.

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Now product of roots = (a+bi)(c-bi) = n/l

Since right side is real, left side also must be real.

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