All categories

3 years ago

How do you Simplify this expression in algebra? 9x + 2x (5 + 4) - 2(5x + 4x)

Mathematics

1 answer:

Minchanka [31]3 years ago

3 0

One can solve this by first using order of operations, and then combining like terms.

First is parenthesis

9x + 2x(9) - 2(9x)

Now we do the multiplication

9x + 18x - 18x

Now we combine like terms

You might be interested in

Find the sum of<br>number line .<br>a) 8+(-3)<br>b) (-2)+(-3)+(-4)

Gnoma [55]

For A

8 + (-3)

8 - 3 = 5

For B

(-2)+(-3)+(-4)

-2 - 3 - 4 = -10

Done.

8 0

2 years ago

Describe the nature of the roots for this equation

vitfil [10]

First, fint the roots of the equation $2x^2+5x-7=0.$

$D=5^2-4\cdot 2\cdot (-7)=25+56=81,\\\sqrt{D}=\sqrt{81}=9,\\ \\x_1=\dfrac{-5-9}{2\cdot 2}=-\dfrac{14}{4}=-3.5,\\ \\x_2=\dfrac{-5+9}{2\cdot 2}=\dfrac{4}{4}=1.$

2. You can see that this equation has two different real roots. Note that you can make this statement without finding roots, only knowing the value of discriminant: since D=81>0, then the equation has two different real roots.

5 0

3 years ago

(2 fiths) to the -2nd power btw, how can i use the camra in this app

Illusion [34]

$\bf ~~~~~~~~~~~~\textit{negative exponents}
\\\\
a^{-n} \implies \cfrac{1}{a^n}
\qquad \qquad
\cfrac{1}{a^n}\implies a^{-n}
\qquad \qquad a^n\implies \cfrac{1}{a^{-n}}
\\\\[-0.35em]
\rule{34em}{0.25pt}\\\\
\left( \cfrac{2}{5} \right)^{-2}\implies \left( \cfrac{5}{2} \right)^{+2}\implies \left( \cfrac{5^2}{2^2} \right)\implies \cfrac{25}{4}\implies 6\frac{1}{4}$

5 0

2 years ago

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. Find the elevation of the pl

AfilCa [17]

Answer:

18 miles

Step-by-step explanation:

Let's call it's initial elevation x. Because it descends 3 miles, we now have x - 3. The question says it is now 15 miles above sea level, or x - 3 = 15, and adding 3 to both sides shows that x = 18 miles.

7 0

3 years ago

A client has requested to have a stamped concrete patio put in their backyard. The plan indicates that the patio will be 16 feet

Ainat [17]

Answer:

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers