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Multiple choice

The root(s) of equation 9x + 2 - 6.3x + 1 + 1 = 0 is/are

    • 2
    • 2
    • 3 and + 3
    • 2 and 0
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Interpreting the middle term as 6 × 3^(x+1), let y = 3^x. The equation becomes 81y^2 - 18y + 1 = (9y - 1)^2 = 0, so 3^x = 1/9 and x = -2.

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