Because if you are multiplying a number, x, three times it is the formula of multiplying a cube!
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No. it isn't. 3x3=9; (x3)x3=27; (3x3)x(3x3)=81, so 9,27,81 are multiples of three.
x5 square units.
It is a polynomial if the square root is in a coefficient but not if it is applied to the variable. A polynomial can have only integer powers of the variable. Thus: sqrt(2)*x3 + 4*x + 3 is a polynomial expression but 2*x3 + 4*sqrt(x) + 3 is not.
If x2 and x3 are meant to represent x2 and x3, then x2 times x3 = x5 You find the product of exponent variables by adding the exponents.
sqrt(x3 + x2) = x*sqrt(x+1) and that cannot be simplified further.