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Varvara68 [4.7K]
3 years ago
13

Factorise completely (2x+1)^2 -(x-1)^2

Mathematics
1 answer:
Vladimir79 [104]3 years ago
5 0
Use photomath ! It's an app that gives you the answer with the explanation and it shows you how it got to the answer !
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Which of the following is a solution of y &gt; |x| - 5? a.(4, -1)<br> B.(-1, -4)<br> C.(-4, 1)
Savatey [412]
Fill your inequality in with the y and x provided and then do the math.  (4, -1) would fill in like this (I will use brackets to indicate absolute value symbols, since there are none in the equation editor): -1\ \textgreater \ [4]-5  The right side is in fact equal to the left side so that's not the answer.  For (-1, -4): -4\ \textgreater \ [-1]-5 and these are also equal.  Let's try C now (-4, 1): 1\ \textgreater \ [-4]-5.  The absolute vale of -4 is 4 so 4 - 5 = -1 which is, in fact, less than 1.  So C is our answer.
8 0
3 years ago
Which of the following is the equation of a line that passed though the points (2,5) and (4,3)
STatiana [176]

The correct answer is C as it has the same line of equation. We can make this clear by verifying that these two points make the same equation or not. So as we can see if we calculate the gradient using the formula y2 - y1 / x2 - x1.

As we now know that the gradient is -1. We can simply put any one point in the equation y - y1 = m(x - x1) to get the line of equation. WHen we calculate the line of equation it come out to be y = -x + 7

4 0
3 years ago
Please someone help me‼️
Flauer [41]

Answer:

6 m

Step-by-step explanation:

The volume of a cone is found by \frac{\pi r^2h}{3}, so we can plug the values in to get 6pi * r^2 / 3 = 72pi, or 6pi * r^2 = 216 pi, so r^2 = 36 and the radius is 6 m.

4 0
3 years ago
Plsssss Answer
Bezzdna [24]

50 per share hope this helped

6 0
3 years ago
Is 3x = x + 8 true?​
ANEK [815]

Answer:

So 3x = x +8 is your equation

We adjust the equation to isolate the x and we end up with 2x = 8

We have to isolate the x even more to turn it into x = 4.

So our final answer is x = 4

5 0
3 years ago
Read 2 more answers
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