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Here 9^(x+2) = 9^x * 9^2 ( ^ sign is used to denote power)
So, the equation becomes:
9^x * 9^2 = 720 + 9^x
Let 9^x = a
Equation becomes:
9^2 * a = 720 + a
81a = 720 + a
80a = 720
a = 9
Now,we know that a = 9^x
So, 9^x = 9^1
Bases are same hence equating the power we get
x = 1