Toán Lớp 8: Phân đa thức thành nhân tử
p) -x^2 – 10x – 25
r) -x^2 + 9
t) 16x^3 -x
s) -1 + y^3
u) 2x^4 – 16
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Toán Lớp 8: Phân đa thức thành nhân tử
p) -x^2 – 10x – 25
r) -x^2 + 9
t) 16x^3 -x
s) -1 + y^3
u) 2x^4 – 16
Comments ( 2 )
p) -x^2 – 10x – 25
= – (x² + 10x + 25)
= – (x + 5)²
r) -x^2 + 9
= 9 – x²
= (3 – x)(3 + x)
t) 16x^3 -x
= x(16x² – 1)
= x(4x – 1)(4x + 1)
s) -1 + y^3
= y³ – 1
= (y – 1)(y² + y + 1)
u) 2x^4 – 16x
= 2x(x³ – 8)
= 2x(x – 2)(x² + 2x + 4)