No. Negative three squared is POSITIVE nine. The square of ANY number is positive, because if you multiply a negative number by a negative number, the result is positive.
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3 squared is 9, 5 squared is 25. So the product is 225.
1 squared radical 40 is equal to 1 squared radical (4 x 10), and this become 2 squared radical 10. By adding 2 squared radical10 with 3 squared radical 10 we get 5 squared radical 10.
2^2 + 3^2 = 4 + 9 = 13
1, -1, 3, -3, 9, -9