`4^x = 5^(x^2)`
applying logarithims on both sides
`ln(4^x) = ln(5^(x^2))`
=> `xln(4) = x^2 (ln(5))`
=> `ln(4) = x (ln(5))`
`x = ln(4) / ln(5) = 0.8613` or `x= 0 `
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