All categories

4 years ago

Which of the following are solutions to the equations below? x^2+x-20=0

Mathematics

2 answers:

Sveta_85 [38]4 years ago

5 0

Answer:

x=4 x=-5

Step-by-step explanation:

x^2+x-20=0

Factor

What 2 numbers multiply to -20 and add to 1

-4*5 =-20 and

-4+5 =1

(x-4) (x+5) =0

Using the zero product property

x-4 =0 x+5=0

x=4 x=-5

irinina [24]4 years ago

4 0

Answer:My answer would be

x=4,-5

tell me if I am wrong

Step-by-step explanation:

You might be interested in

Find the solution to the system of equations.

Tanya [424]

Answer:

x = - 4, y = 7

Step-by-step explanation:

Given the 2 equations

- 7x - 2y = 14 → (1)

6x + 6y = 18 → (2)

Multiplying (1) by 3 and adding to (2) will eliminate the y- term

- 21x - 6y = 42 → (3)

Add (2) and (3) term by term to eliminate y

- 15x = 60 ( divide both sides by 15 )

x = - 4

Substitute x = - 4 into either of the 2 equations and evaluate for y

Substituting into (2)

6(- 4) + 6y = 18

- 24 + 6y = 18 ( add 24 to both sides )

6y = 42 ( divide both sides by 6 )

y = 7

7 0

3 years ago

The perimeter of one of the rectangular playrooms at Miss Pittypat's Day Care is 72 feet. It's width is 10 feet.

Alex17521 [72]

Answer:

The area of the rectangular playroom is 260 feet² .

Step-by-step explanation:

Given:

The perimeter of the rectangular playroom is 72 feet and it's width is 10 feet.

Now, to find its area we need the length .

So, putting the formula of perimeter we get it's length:

Let the length be l .

Perimeter = 2( length + width)

$72=2(l+10)$

$72=2l+20$

subtracting both sides from 20:

$72-20=2l+20-20$

$52=2l$

Dividing both sides by 2:

$52\div2=2l\div2$

$26=l$

Length is 26 feet.

And, to get the area we put the formula of finding the area:

$Area=length\times width$

$Area=26\times 10$

$Area=260$

Therefore, the area of the rectangular playroom is 260 feet² .

3 0

3 years ago

Choose the correct simplification of the expression (7ab^3)^2

ladessa [460]

Answer:49a^2b^6

Step-by-step explanation:

(7ab^3)^2=7^2×a^2×b^6=49a^2b^6lpp

3 0

4 years ago

Solve the system of linear equations using any method 6x+6y=-6, 5x+y=-13

Sergio [31]

Answer:

x=-3

y=2

Step-by-step explanation:

To solve this problem you can use the elimination method:

- Multiply the second equation by -6:

$(-6)5x+y=-13\\-30x-6y=78$

- Add both equations:

$6x+6y=-6\\-30x-6y=78\\-------\\-24x=72\\x=-3$

- Substitute the value of x into one of the original equations and solve for y:

$6(-3)+6y=-6\\-18+6y=-6\\6y=12\\y=2$

8 0

3 years ago

Read 2 more answers

What's 8/7x^3+x^4+6x+1 in standard form

Fynjy0 [20]

Please enclose fractions such as 8/7 inside parentheses:

<span>(8/7)x^3+x^4+6x+1

Next, arrange these four terms in order of power of x:

</span>x^4 + (8/7)x^3+ 6x+1 This is the standard form you wanted.

4 0

3 years ago