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Ewe Tek Min · Answer 1 · 2018-03-24T11:06:12+0000

I believe your equation (- 5r2s)(rs2) should have been written (-5r².s)(r.s²)
If so, remember that aⁿ x . aˣ = a⁽ⁿ⁺ˣ⁾

Multiply each term of te second parenthesis by each term of the 1st parenthesis:

= - 5. r²⁺¹.s²⁺¹. = -5.r³. s³

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