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Sagot :

Bjr,

2x * x + 2x * - 1 + 3x - 3 = 2x² - 2x + 3x - 3 = 2x² + x - 3.

2 * (-1)² - 1 - 3 = 2 * 1 - 4 = 2 - 4 = - 2

2 * 5² + 5 - 3 = 2 * 25 + 2 = 50 + 2 = 52

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