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svet-max [94.6K]
3 years ago
8

-7x^2+14x+21=0answer?​

Mathematics
1 answer:
scoray [572]3 years ago
6 0

Answer:

7(−x−1)(x−3)

Step-by-step explanation:

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URGENT!!!
allsm [11]

Answer:

inequality form -2<x<5

interval notation (-2,5)

sure of my answer

−Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Multiply and simplify. (x - 1)(x - 1)(x - 1)
Tanzania [10]
(sorry if it's too late and you've already figured it out, but here you go anyway)
The easiest way to do this is to start by FOILing then add.
So just start with (x-1)(x-1)
(x-1)(x-1)
Front: (x*x) = x^2
Outer: (x*-1) = -x
inner: (-1*x) = -x
Last: (-1*-1) = 1
Added: x^2 -2x +1
Now take that answer and do the same thing with (x-1). It's basically the same thing, just with an added thing you need to multiply.
(x-1)(x^2-2x+1)
(x*x^2) = x^3
(x*2x) = 2x^2
(x*1) = x
(-1*x^2) = -x^2
(-1*-2x) = 2x
(-1*1) = -1
Now add everything together:
x^3+2x^2+x-x^2+2x-1
The answer is:
x^3+x^2+3x-1
3 0
2 years ago
Karen is waiting for a pot of soup to cool
Studentka2010 [4]

Answer:

It went down 5.5°C a minute.

Step-by-step explanation:

You have to look for the difference of 100 and 78, which is 22.

Divide the difference with the minutes (4), equalling 5.5.

4 0
3 years ago
How old are you if you graduated high school in 2009
IRISSAK [1]
Assuming the graduate was 18 when they graduated they would be 26. 

2017- 2009 = 8

18 + 8 = 26
6 0
3 years ago
Read 2 more answers
Make a the subject get a on its own x(a+2)=7
crimeas [40]
X (a + 2) = 7

First let's multiply out the brackets on the left side of the equation.
x (a + 2) --> Multiply everything inside the brackets by x.
xa + 2x = 7

Now, both elements of the left-hand side of the equation contain x, so we can divide both sides of the equation by x.

xa + 2x = 7
    a + 2 = 7/x

To find a now, just subtract 2 from both sides.
a = 7/x - 2
7 0
3 years ago
Read 2 more answers
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