3 years ago

Solve the equation 7x^2+21=0

1 answer:

6 0

Subtract 21 from both sides
7x^2=-21
Divide by seven on both sides
X^2=-3
Square root both sides

***X= square root of -3***
:)

You might be interested in

Jeff rode his bike around a bike trail that was 1/3 of a mile long. He rode around the trail 9 times. Write a fraction greater t

Lisa [10]

Well, $\frac{1}{3} * 9 = 3$ So he rode $3$ miles, or if they want it as a fraction, it would be $\frac{9}{3}$

8 0

3 years ago

Read 2 more answers

4. Steve has a card collection. He keeps 12 of the cards in a pocket, which

BabaBlast [244]

Answer:

I think 80

Step-by-step explanation:

100/15=6.66666667

12x6.67=80.4

4 0

3 years ago

What happens when y = -f(-x)?

IgorLugansk [536]

Answer:

It's a reflection over the x axis.

Step-by-step explanation:

Idk I googled it.

3 0

3 years ago

Solve the system of equations. \begin{aligned} & -5y-10x = 45 \\\\ &-3y+10x=-5 \end{aligned} −5y−10x=45 −3y+10x=−5

sineoko [7]

Answer:

x = -2

y = -5

Step-by-step explanation:

We can solve this algebraically (substitution or elimination) or graphically. I will be using elimination:

Step 1: Add the 2 equations together

-8y = 40

y = -5

Step 2: Plug <em>y </em>into an original equation to find <em>x</em>

-3(-5) + 10x = -5

15 + 10x = -5

10x = -20

x = -2

And we have our final answers!

7 0

3 years ago

Read 2 more answers

Using the ratio of perfect squares method, what is square root of 22 rounded to the nearest hundredth?

Alja [10]

$4+ \frac{22-16}{25-16} = \\\\ 4 + \frac{6}{9} =\\\\4 + \frac{2}{3} 
=\\\\ \boxed{\bf{4.67}}$
Using the ratio of perfect squares method, the square root of 22 rounded to the nearest hundredth is 4.67

Hope this helps!! If you have any other questions or would like further explanation just let me know!! :)

5 0

3 years ago