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CORRECT ANSWER-BRAINLISS
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1.) (a + 5)²
= a² + 2a × 5 + 5²
= a² + 10a + 25 (answer)
2.) (3xy - 7)²
= (3xy)² - 2 × 3xy × 7 + 7²
= 9x²y² - 42xy + 49 (answer)
3.) (x + y)²
= x² + 2xy + y² (answer)
4.) (2x + 3y)²
= (2x)² + 2 × 2x × 3y + (3y)²
= 4x² + 12xy + 9y² (answer)
5.) (3a + 2c)²
= (3a)² + 2 × 3a × 2c + (2c)²
= 9a² + 12ac + 4c² (answer)