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motikmotik
3 years ago
14

How do work this out

Mathematics
1 answer:
BabaBlast [244]3 years ago
6 0
We can factor this by using grouping. Take the leading coefficient and multiply it by the constant. In this case we get 5*-7 = -35. 

Now we need 2 numbers that add to 2 and multiply to be -35. The numbers are -5 and 7.

So split the 2r into these two terms and group.

(5r^2 - 5r) + (7r - 7)

Factor both groups.

5r(r-1) + 7(r-1)

The factors of (r-1) can be added together to get the answer.

(r-1)(5r+7)
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Step-by-step explanation:

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Required

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3 years ago
if your answer is "No," how much more lacquer does she need? if your answer is "yes," how much lacquer will she have left over?
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So ,maybe u find the answer

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if your answer is "No," how much more lacquer does she need? if your answer is "yes," how much lacquer will she have left over?AND if it is also no ,yes , no...show your work to justify your answer.

3 0
3 years ago
The graph below shows a system of equations: Draw a line labeled y equals minus x plus 5 by joining the ordered pairs 0, 5 and 5
Montano1993 [528]

Answer:

The x-coordinate of the solution is x=3

Step-by-step explanation:

we have

y=-x+5 ------> equation A

y=x-1 ------> equation B

Solve the system of equations by substitution

Substitute equation B in equation A and solve for x

x-1=-x+5

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2x=6

x=3

Find the value of y

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The solution of the system of equations is the point (3,2)

therefore

The x-coordinate of the solution is x=3

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