In this question x^y stands for x raised to the power y. For example ,2^3=8 and

In this question x^y stands for x raised to the power y. For example ,2^3=8 and 4^1.5=8. If a,b are real numbers such that a+b=3, a^2+b^2=7, the value of a^4+b^4 is?

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