exam Maths Puzzle Numerical Ability

10y^4 + 15y^6

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exam Other Question

Multiply, Using the vertical method. (m^2-5mn +3n^2)(m^2+4mn-2n^2)

I can not figure out the vertical method or may be I am making it harder than it really is. Thanks. 17 -(4k - 2) > 2 (k + 3)