Question

(2x+6)×(2,5x-5)=0 помогитє

Answer 1

Пошаговое объяснение:

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Answer 2

$5 {x}^{2} - 10x + 15x - 30 = 0 \\ 5 {x}^{2} + 5x - 30 = 0 \\ d = 25 - 4 \times 5 \times ( - 30) = 25 + 600 = 625 = {25}^{2} \\ x1 = \frac{10 + 25}{10} = 3.5 \\ x2 = \frac{10 - 25}{10} = - 1.5$