$7^{2(x+1)}$ + 72x = 350
$7^{2x} + 7^2 + 7^{2x}$ = 350
$7^{2x} \times 7^2 + 7^{2x}$ = 35
Let $7^{2x}$ = y
49y + y = 350
50y = 350
y = 7
$7^{2x}$ = $7^1$
2x = 1
x = $\frac{1}{2}$
johnmulu answered the question on June 12, 2017 at 13:58
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