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ada dua kemungkinan.
a. m^2 + 7n^2 + 4m^2 - 5n^2
= 5m^2 + 2n^2
b. m^2 + 7n^2 + 4m^2 + 5n^2
= 5m^2 + 12n^2
2. 2(p+l)
= 2 ( (8x-3) + (2x+5) )
= 2 ( 10x+2 )
= 20x + 4