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1.
(2x - y)² = 2x² - 2(2x)(y) + y²
= 4x² - 4xy + y²
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2.
(3x + 5) (3x + 5)
3x² + 5²
9x² + 25
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3.
(x + 4) (x - 3)
x² - x - 12
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4.
(3x - 5y)² = 3x² - 2(3x)(5y) + 5y²
= 9x² - 30xy + 25y²
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6.
(2x + 5y) (2y - 5y)
2x² - 5y²
4x² - 25y²
................................................................
7.
(x - 10) (x - 8)
x² - 8x + 10x - 80 x ²
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8.
(2x - 4y)⁴ = 2x⁴ - 4(2x)(4y) + 4y⁴
= 16x⁴ - 32xy + 256y⁴
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9.
(2x² - 3y)² = 2x² - 2(2x²)(3y) + 3y²
= 4x² - 12x²y + 9y²
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10.
(3x² + 4y) (3x² - 4y)
3x² - 4y²
9x² - 16y²
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11.
(x - 11) (x + 4)
x² - 4x + 11x + 44
x² - 7x + 44