An expression that can not be simplified any further, but could be expressed in many ways. For example:
4x
4 × x
x × 4
4 · x
x + x + x + x
Literally speaking, it means "four times the value of x".
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There aren't four integers that can be multiplied to get 49... unless you allow the trivial case where "1" is used twice: 49 = 7 x 7 x 1 x 1
Do you mean volume or surface area? volume = 4/3 x pi x r^3 (four divided by three, multiplied by pi, multiplied by radius cubed). surface area = 4 x pi x r^2 (four multiplied by pi, multiplied by radius squared).
2 x 5 x 11 x 43
4/3 x 1077 = 1436
3 x 3 x 3 x 11 = 297