Question

find the degree of (m²- n²) (m²+n²)​

Answer 1

Answer:

m+n=5

Squaring both the sides

m²+n²+2mn=25

m²+n²+12=25

m²+n²=13

Now m³+n³=(m+n) (m²+n²-mn)

=5(13-6)

=35

Hence m²+n²) (m³+n³) =13(35)

=455

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Answer 2

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

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