Simplify using suitable identity: (4√5 – 7) 2.
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8√5-14
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Step-by-step explanation:
Use formula :-
- (a - b) ² = a² + b² - 2ab
→ (4√5 - 7) ² = (4√5) ² + (7) ² - 2 × 4√5 × 7
- (16 × 5) + 49 - 14 × 4√5
- 80 + 49 - 56√5
- 129 - 56√5
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