46.
pq - 20k³ - 4k²p - 5qk =
= p(q - 4k²) - 5k(4k² + q) =
= p(q - 4k²) + 5k(q - 4k²) =
= (q - 4k²)(p + 5k).
47.
15x² + 2yz - 5xz - 6xy =
= 5x(3x - z) + 2y(z - 3x) =
= 5x(3x - z) - 2y(3x - z) =
= (3x - z)(5x - 2y),
48.
mp + 10n² - 2mn - 5np =
= m(p - 2n) + 5n(2n - p) =
= m(p - 2n) - 5n(p - 2n) =
= (p - 2n)(m - 5n),
49.
x⁴ + 2a²x² - 4a²b² - 4b⁴ =
= x²(x² + 2a²) - 4b²(a² + b²),
50.
a⁴ - 4a³b - 12a²b² - 8ab³ - b⁴ =
= (a⁴ - b⁴) - (4a³b + 12a²b² + 8ab³) =
= (a² - b²)(a² + b²) - 4ab(a² + 3ab + 2b²) =
= (a - b)(a + b)(a² + b²) - 4ab(a² + 3ab + 2b²)
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Answers & Comments
46.
pq - 20k³ - 4k²p - 5qk =
= p(q - 4k²) - 5k(4k² + q) =
= p(q - 4k²) + 5k(q - 4k²) =
= (q - 4k²)(p + 5k).
47.
15x² + 2yz - 5xz - 6xy =
= 5x(3x - z) + 2y(z - 3x) =
= 5x(3x - z) - 2y(3x - z) =
= (3x - z)(5x - 2y),
48.
mp + 10n² - 2mn - 5np =
= m(p - 2n) + 5n(2n - p) =
= m(p - 2n) - 5n(p - 2n) =
= (p - 2n)(m - 5n),
49.
x⁴ + 2a²x² - 4a²b² - 4b⁴ =
= x²(x² + 2a²) - 4b²(a² + b²),
50.
a⁴ - 4a³b - 12a²b² - 8ab³ - b⁴ =
= (a⁴ - b⁴) - (4a³b + 12a²b² + 8ab³) =
= (a² - b²)(a² + b²) - 4ab(a² + 3ab + 2b²) =
= (a - b)(a + b)(a² + b²) - 4ab(a² + 3ab + 2b²)