3 years ago

What is the number system

2 answers:

8 0

A number system is a system for representing numbers of a certain type. We usually use the base 10 number system, or the decimal number system, employing 10 as the base and and requiring 10 different numerals, the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.

xxTIMURxx [149]3 years ago

6 0

A numeral system (or system of numeration) is a writing system for expressing numbers; that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. Hope this helps :))

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quester [9]

Answer:

$\large\boxed{C.\ 2x^3-x^2-18x+9}$

Step-by-step explanation:

$\text{Use}\ a^2-b^2=(a-b)(a+b)\qquad(*)\\\\\underbrace{(x-3)(x+3)}_{(*)}(2x-1)=(x^2-3^2)(2x-1)=(x^2-9)(2x-1)\\\\\text{Use FOIL:}\ (a+b)(c+d)=ac+ad+bc+bd\\\\=(x^2)(2x)+(x^2)(-1)+(-9)(2x)+(-9)(-1)\\\\=2x^3-x^2-18x+9$