Thực hiện phép tính
----- Nội dung dịch tự động từ ảnh -----
11) \( x^3 - 4x^2 - 9x + 36 = 0 \)
12) \( 5x^2 - 4(x^2 - 2x + 1) + 20 = 0 \)
13) \( 5x^3 + 3x^2 + 3x + 1 = -23x^3 \)
14) \( x^2 + 5x = 0 \)
15) \( x^2 - 5x = 0 \)
16) \( x^3 + x^2 = 0 \)
17) \( (x + 1)^2 - (x + 1)(x - 1) = 0 \)
18) \( (x - 1)(x - 2) = 0 \)
19) \( \left( \frac{x}{2} - 3 \right) \left( x + \frac{1}{3} \right) = 0 \)
20) \( (2x - 1)(x + 3)(2 - x) = 0 \)
11) \( x^3 - 4x^2 - 9x + 36 = 0 \)
12) \( 5x^2 - 4(x^2 - 2x + 1) + 20 = 0 \)
13) \( 5x^3 + 3x^2 + 3x + 1 = -23x^3 \)
14) \( x^2 + 5x = 0 \)
15) \( x^2 - 5x = 0 \)
16) \( x^3 + x^2 = 0 \)
17) \( (x + 1)^2 - (x + 1)(x - 1) = 0 \)
18) \( (x - 1)(x - 2) = 0 \)
19) \( \left( \frac{x}{2} - 3 \right) \left( x + \frac{1}{3} \right) = 0 \)
20) \( (2x - 1)(x + 3)(2 - x) = 0 \)