Toán Lớp 8: a)x^2 + 4x – 12
b)x^2 + 2x – 15
giúp em 2 câu này với ạ
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Toán Lớp 8: a)x^2 + 4x – 12
b)x^2 + 2x – 15
giúp em 2 câu này với ạ
Comments ( 2 )
=16-(x^2 +2x+1)
=[4-(x+1) ][4+(x+1) ]
=(3-x)(5+x)
Mode + 5 + 3
= x ² -2x + 6x -12
= (x ² -2x) + ( 6x -12)
= x ( x-2) + 6 ( x- 2 )
=(x-2) (x+ 6)
b) x² + 2x – 15
= x² -3x +5x – 15
=( x² -3x) +(5x – 15)
= x(x-3) + 5(x-3)
= (x-3)(x+5)