因式分解-12x的平方y+4xy-8xy的平方= x的四次方-x的三次方= 2a的四次方-6a的三次方-2a
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ax² + 2a²x + a³ = a(x² + 2ax + a²) = a(x + a)²
16x⁴- 8x²y² + y⁴= (4x²)² - 2(4x²)y² +(y²)² = (4x² - y²)² = (2x + y)²(2x - y)²
x⁴+xy³ = x(x³ + y³) = x(x + y)(x² -xy +y²)
x³ - 5x² - 14x = x(x² - 5x - 14) = x(x + 2)(x - 7)
(x² - 5)² + 8(x² - 5) + 16 = [(x² - 5) + 4]² = (x² - 1)² = (x + 1)²(x - 1)²
(x² + 4)² - 16x² = [(x² + 4) + 4x][(x² + 4) - 4x] = (x + 2)²(x - 2)²
16x⁴- 8x²y² + y⁴= (4x²)² - 2(4x²)y² +(y²)² = (4x² - y²)² = (2x + y)²(2x - y)²
x⁴+xy³ = x(x³ + y³) = x(x + y)(x² -xy +y²)
x³ - 5x² - 14x = x(x² - 5x - 14) = x(x + 2)(x - 7)
(x² - 5)² + 8(x² - 5) + 16 = [(x² - 5) + 4]² = (x² - 1)² = (x + 1)²(x - 1)²
(x² + 4)² - 16x² = [(x² + 4) + 4x][(x² + 4) - 4x] = (x + 2)²(x - 2)²
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