Evaluate the following quadratic expressions

1. (2s-5t)(3s+t)
Expand
4s^2 + 2st -15st -5t^2
Rearrange and collect like terms
4s^2 -5t^2-13st

Following same procedure
(2c-9e)(4c+5e)
We have 
8c^2 -26ce-45e^2

(4m-n)(3m-n)
Expand
12m^2-4mn-3mn+n^2
Rearrange and collect like terms
12m^2-7mn+n^2

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