9x2 + 25 – 30x can be expressed as the square of

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9x² + 25 – 30x can be expressed as the square of

1. –3x – 5
2. 3x + 5
3. 3x – 5
4. 3x² – 25

Correct Option: C

9x² + 25 – 30x
= (3x)² + (5)² – 2 × 3x × 5
= (3x – 5)²