Question

Phân tích thành nhân tử:
a. 5x⁴y³-15x³y²
b.8x³-64y³
c.x²+3x+3y-y²
d.3(2x-3)+4²-9

Answer 1

a) 5x⁴y³ - 15x³y²

= 5x³y².(x - 3)

b) 8x³ - 64y³

= 8.(x³ - 8y³)

= 8.(x - 2y)(x² + 2y + 4)

c) x² + 3x + 3y - y²

= (x² - y²) + (3x + 3y)

= (x - y)(x + y) + 3(x + y)

= (x + y)(x - y + 3)

d) Sửa đề:

3(2x - y) + 4x² - 9

= 3(2x - y) + (4x² - 9)

= 3(2x - y) + (2x - y)(2x + y)

= (2x - y)(2x + y + 3)