2*2=4+5=9 Answer is 9
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5x^2(x^2 + 5)
The first and third are quadratic expressions in x, the second is a quadratic expressions in n, and the fourth is a quadratic expressions in y. None of them are equations so cannot be solved.
In the number 25 the exponent is 5. Whereas, 2 is the base.
231 + 231 = 2 x 231 = 232
52 (5 is the base and 2 is the exponent or power). The 2 says to multiply 5 by itself 2 times. 5*5 = 25