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-3 x -3 =
9
When you multiply to negative values, the negatives cancel each other out to give a positive product.
When you multiply two variables with different exponents, the exponents are added. For example, if you multiply x^2 by x^3, the result is x^(2+3) = x^5. Similarly, if you multiply x^3 by x^(-2), the result is x^(3+(-2)) = x^1 = x.
The algebraic expression for x times x is x2 ( x squared).
Assuming the bases are the same, you add the exponents. 10^3 x 10^3 = 10^6
2 x 2 x 3 x 3
Multiply 2 x 2 x 3 x 3