Tolong bantu jawab ya sama pakai jalan

Tolong bantu jawab ya sama pakai jalan

${3}^{2x + 2} + 8. {3}^{x} - 1 = 0 \ ( { {3}^{x}) }^{2} .{3}^{2} + 8. {3}^{x} - 1 = 0 \ misal : {3}^{x} = y \ 9{y}^{2} + 8y - 1 = 0 \ (9y - 1)(9y + 9) = 0 \ (9y - 1)(y + 1) = 0 \ y = frac{1}{9} : atau : y = - 1 \ \ y = frac{1}{9} \ {3}^{x} = frac{1}{9} \ {3}^{ - 2} = frac{1}{9} \ x = - 2 \ \ y = - 1 : tdk : ada : penyelesian : \ \ hp = x = - 2$
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