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kvasek [131]
3 years ago
10

Find the product of (x + 5)(x − 5) and show work

Mathematics
2 answers:
AleksandrR [38]3 years ago
8 0

(x + 5) * (x − 5) =

x² - 25

----------------

x * x = x² and 5 * (-5) = -25

Drupady [299]3 years ago
4 0

This is a special pattern of multiplication, because it is the sum of two terms multiplied by their difference.

In this case, the result is the difference of the squares of the two numbers:

(a+b)(a-b) = a^2-b^2

So, in this case, the result is the square of x minus the square of 5:

(x+5)(x-5) = x^2-5^2 = x^2-25

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\bf \qquad \qquad \textit{Future Value of an ordinary annuity}\\
\left. \qquad \qquad \right.(\textit{payments at the end of the period})
\\\\
A=pymnt\left[ \cfrac{\left( 1+\frac{r}{n} \right)^{nt}-1}{\frac{r}{n}} \right]

\bf \qquad 
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8000
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pymnt=\textit{periodic payments}\\
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\bf 8000=pymnt\left[ \cfrac{\left( 1+\frac{0.05}{12} \right)^{12\cdot 4}-1}{\frac{0.05}{12}} \right]
\\\\\\
\cfrac{8000}{\left[ \frac{\left( 1+\frac{0.05}{12} \right)^{12\cdot 4}-1}{\frac{0.05}{12}} \right]}=pymnt\implies \cfrac{8000}{\frac{\left( \frac{241}{240} \right)^{48}-1}{\frac{1}{240}}}=pymnt
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6 0
3 years ago
The corner convenience store sells candy bars at 4 for $2.91. At the price, how much would the store charge for 3 candy bars?
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So according to that logic,

<em>0.7275  x 3 = $2.1825.</em>

<em />

6 0
2 years ago
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