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Inessa05 [86]
2 years ago
7

 For what value of x is the double product of the binomials x+2 and x–2 is 16 less than the sum of their squares?

Mathematics
2 answers:
solong [7]2 years ago
4 0

x = 2 + 2 - 2 = 4

hope it helps! :D

oee [108]2 years ago
4 0
\bf \begin{cases}
x+2\\\\
x-2
\end{cases}
\begin{cases}\qquad 
product\\
----------\\
(x+2)(x-2)\to x^2-4\leftarrow \textit{difference of squares anyway}\\\\
\textit{double that product}\\
----------\\
\boxed{2(x^2-4)}
\\\\\\
\textit{sum of their squares}\\
----------\\
(x+2)^2+(x-2)^2\\\\
\textit{16 less than that}\\
----------\\
\boxed{(x+2)^2+(x-2)^2-16}
\end{cases}

so.. for what values of "x", are those two expressions, equal to each other then?

well \bf 2x^2-8=x^2\underline{+2x}+4+x^2\underline{-2x}+4-16
\\\\\\
2x^2-8=2x^2+8-16\implies 
\begin{array}{llll}
2x^2-8&=&2x^2-8\\
same&=&same
\end{array}

for a system of equations, the solutions are where the graph converge, or intersect

well, in this case, the left-hand-side expression is exactly the same as the right-hand-side expression
 
so.. if you were to graph the one on the left-hand-side, it's just a parabola shifted vertically down by 8units

if you were to graph the right-hand-side expression, it will be exactly the same, just the same parabola right on top of the other, pancaked on one another

when both expressions are equal, the system has "infinite number of solutions", which is another way to say, for all values of "x", there's a solution

so.. for what values for "x" are those two expressions equal? for all values of "x"  or (-\infty,+\infty)\quad or\quad x\in \mathbb{R}, if you like an interval or set notation
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Answer:

The circumference of the circle is 6 cm (approximately).

Step-by-step explanation:

Given:

Area of the circle = 1/4π²

Now, to get the circumference of the circle we need the radius.

So, finding the radius by putting the formula of area:

Area = \pi r^{2}

\frac{1}{4} \pi ^{2} = \pi r^{2}

dividing π by both sides:

\frac{1}{4}\pi=r^{2}

using square root on both the sides:

\frac{1}{2}\sqrt{\pi } = r

So, the radius is \frac{1}{2}\sqrt{\pi }

Now, putting the formula of circumference:

circumference=2\pi r

                              =2\pi\frac{1}{2} \sqrt{\pi}

                              =\pi \sqrt{\pi}

putting the value of π =3.14

                              =3.14\times\sqrt{3.14}

                              =3.14\times1.77

                              =5.56

Circumference = 5.56 cm

Therefore, the circumference of the circle is 6 cm (approximately).

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cestrela7 [59]

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$50 per ticket.

Step-by-step explanation:

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The more you raise the price, the less tickets you can sell.

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The probability that the next person will be assigned an orchestra seats is 2/5.

<h3>What is Probability?</h3>

Probability can be defined as the ratio of the number of favorable outcomes to the total number of outcomes of an event.

Here, Available Orchestra seats = 8

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      Total available seats = 12 + 8 = 20

  Probability = Favorable Outcome / Total Outcome

  Probability of getting orchestra ticket = 8/20

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Thus, the probability that the next person will be assigned an orchestra seats is 2/5.

Learn more about Probability from:

brainly.com/question/14210034

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