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2023

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- A.
3
- B.
4
- C.
7
- D.
More than one of the above
- E.
None of the above
Attempted by 8 students.
Show answer & explanation
Correct answer: A
Step 1: Express 49 as a power of 7: 49 = 7².
Step 2: Rewrite the right side: 49^(3x+12) = (7²)^(3x+12) = 7^(2(3x+12)) = 7^(6x+24).
Step 3: Now the equation is 7^(12x+6) = 7^(6x+24).
Step 4: Since the bases are equal, set the exponents equal: 12x + 6 = 6x + 24.
Step 5: Solve for x: 12x - 6x = 24 - 6 → 6x = 18 → x = 3.
हिन्दी उत्तर:
चरण 1: 49 को 7 की घात के रूप में लिखें: 49 = 7²।
चरण 2: दाईं ओर को लिखें: 49^(3x+12) = (7²)^(3x+12) = 7^(2(3x+12)) = 7^(6x+24)।
चरण 3: अब समीकरण 7^(12x+6) = 7^(6x+24) है।
चरण 4: चूँकि आधार समान हैं, घातांकों को बराबर रखें: 12x + 6 = 6x + 24।
चरण 5: x का मान ज्ञात करें: 12x - 6x = 24 - 6 → 6x = 18 → x = 3।
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