Question

Simplify.

2m2 – 4n2 + 3m – 6m2 – 2m + 7n2

A.
−4m2 + 3n2 + m

B.
−4m2 + 3n2

C.
–36m + 28n

D.
9m2 + 6m + 11n2

Answer 1

@Mehek14

Answer 2

i think its B or A

Answer 3

can someone help me

Answer 4

can someone help me

Answer 5

hint:
I can rewrite the original expression, grouping similar terms, like below:
\[\left( {2{m^2} - 6{m^2}} \right) + \left( {7{n^2} - 4{n^2}} \right) + \left( {3m - 2n} \right) = ...?\]
please continue

Answer 6

thanks for the hint but i still barly get it

Answer 7

oops.. I have made a typo:
\[\left( {2{m^2} - 6{m^2}} \right) + \left( {7{n^2} - 4{n^2}} \right) + \left( {3m - 2m} \right) = ...?\]

Answer 8

for example, what is:
\(2m^2-6m^2=(2-6)m^2=...?\)

Answer 9

i have no idea

Answer 10

what is \(2-6=...?\)

Answer 11

4

Answer 12

it is \(-4\), since \(-4+6=2\)
so the first term is:
\(-2m^2\)

Answer 13

similarly, what is:
\(7n^2-4n^2=(7-4)n^2=...?\)

Answer 14

hint:
what is \(7-4=...?\)

Answer 15

3

Answer 16

perfect! So, the second term is \(3n^2\)
finally, what is:
\(3m-2m=(3-2)m=...?\)

Answer 17

hint:
\(3-2=...?\)

Answer 18

1

Answer 19

that's right!
so the third term is: \(m\), and the final result is:
\(-4m^2+3n^2+m\)
So, what is the right option?

Answer 20

-1

Answer 21

I meant what is the right option:
A, B, C or D?

Answer 22

B

Answer 23

?

Answer 24

we got the result, from the discussion above, such result is:
\[\begin{gathered}
\left( {2{m^2} - 6{m^2}} \right) + \left( {7{n^2} - 4{n^2}} \right) + \left( {3m - 2m} \right) = ...? \hfill \\
\hfill \\
= - 4{m^2} + 3{n^2} + m \hfill \\
\end{gathered} \]

Answer 25

so, what is the right option: A, B, C or D?

Answer 26

Medal Michele

Answer 27

option B is not the right option, since it contains only two terms, whereas the final result contains three terms

Answer 28

i meant to say A

Answer 29

that's right! :)

Answer 30

Good job! :)

Answer 31

thanks!! :) @FireFang

Answer 32

No problem!