Question

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Answer 1

Răspuns:

$3 {x}^{2} \times (x - 5) + (5 - x) \times ( {x}^{2} + 1) = 3 {x}^{3} - 15 {x}^{2} + (5 {x}^{2} + 5 - {x}^{3} - x) = \\ = 3 {x}^{3} - 15 {x}^{2} + 5 {x}^{2} + 5 - {x}^{3} - x = \\ = 2 {x}^{3} - 10 {x}^{2} - x + 5$