Question

What should be Subtract the sum of 2mn +6m² – n? and m² – 3mn +4n? from mn - m² + 4.​

Answer 1

Answer:

Part(i)

Add

=m−n+m+n=2m

Subtract

=m−n−m−n=−2n

Part(ii)

Add

=mn+5−2+mn+3=2mn+6

Subtract

=mn+5−2−mn−3=0

Hence, this is the answer

Answer 2

Answer:

by taking sum of the equation

(2mn+6m²-n²) + (m²-3mn+4n)

(2mn-3mn)+(6m²+m²)+(-n²)+4n

we get,

-mn+7m²-n²+4n

by subtracting (mn - m² + 4) from the sum of above equations,

(-mn+7m²-n²+4n) - (mn - m² + 4)

(-mn-mn)+(7m²+m²)-n²+4n+4

we get,

-2mn+8m²-n²+4n+4

Step-by-step explanation:

for checking if your answer is correct or not

(-mn+7m²-n²+4n) - (-2mn+8m²-n²+4n+4)

2mn+8m²-n²+4n+4-mn-7m²+n²-4n

(2mn-mn)+(-8m²+7m²)+(-n²+n²)+(4n-4n)+4

mn-m²+4