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Exponents — MATHS STD 7 — Question

Gujarat BoardEnglish MediumSTD 7MATHSExponents1 Mark
Question
If 9 × 3n = 36, then n = .......... .
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Answer

If 9 × 3n = 36, then n = 4.

Solution:

If 9 × 3n = 36

⇒ 32 × 3n = 36

⇒ 3(2+n) = 36

Equating the powers:

⇒ (2 + n) = 6

⇒ n = (6 - 2) = 4

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