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--> x^2 - 5x + 2x - 10
--> x^2 - 3x + 10
= 3x + 3 - 2a - 5x - 7 - 5a
= 3x - 5x + 3 - 7 - 2a - 5a
= -2x - 4 - 7a
2. (x + 2) x (x - 5)
= (x × x) - (x × 5) + (2 × x) - (2 ×5)
= x^2 - 5x + 2x - 10
= x^2 - 3x - 10
no 3 susah nulis