Toán Lớp 8: phân tích
3x^2-5x-2
3x^2-9x-30
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Toán Lớp 8: phân tích
3x^2-5x-2
3x^2-9x-30
Comments ( 2 )
<=> 3x2 + 6x – x – 2
<=> (3x2 + 6x) – (x + 2)
<=> 2x(x + 2) – (x + 2)
<=> (2x – 1)(x + 2)
b) 3x2 – 9x – 30
<=> 3x2 + 6x – 15x – 30
<=> (3x2 + 6x) – (15x + 30)
<=> 3x(x + 2) – 15(x + 2)
<=> (3x – 15)(x + 2)
<=> 3(x – 5)(x + 2)