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(7x + 12)2 – 336x is equal to 1. (7x + 11)22. (7x + 9)23. (7x – 9)24. (7x – 12)2 |
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Answer» Correct Answer - Option 4 : (7x – 12)2 Formula used: (a + b)2 = a2 + b2 + 2ab Calculation: (7x + 12)2 – 336x ⇒ 49x2 + 144 + 168x – 336x ⇒ 49x2 – 168x + 144 ⇒ 49x2 – 84x – 84x + 144 ⇒ 7x (7x – 12) – 12(7x –12) ⇒ (7x – 12)(7x –12) ⇒ (7x – 12)2 ∴ The required answer is (7x – 12)2 |
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