Toán Lớp 8: Phântichs đa thức thành nhân tử :x^2+2x-9y^2+1
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Toán Lớp 8: Phântichs đa thức thành nhân tử :x^2+2x-9y^2+1
Comments ( 2 )
x^2+2x-9y^2+1
= (x² – 2x + 1) – 9y²
= (x – 1)² – 9y²
= (x – 1 + 9y)(x – 1 – 9y)
x^2 + 2x – 9y^2 + 1
= ( x^2 + 2x + 1 ) – 9y^2
= ( x + 1 )^2 – ( 3y )^2
= ( x + 1 – 3y ).( x + 1 + 3y )