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fiasKO [112]
3 years ago
15

How to write function in standard form

%20%2B%201%29%28x%20-%201%29" id="TexFormula1" title="f(x) = (2 \times + 1)(x + 1)(x - 1)" alt="f(x) = (2 \times + 1)(x + 1)(x - 1)" align="absmiddle" class="latex-formula">
Mathematics
2 answers:
mafiozo [28]3 years ago
5 0
Multiply it out.
  f(x) = (2x +1)(x² -1) . . . . . . recognize the factoring of the difference of squares
  f(x) = 2x³ +x² -2x -1
HACTEHA [7]3 years ago
5 0
The standard form:
f(x)=ax^3+bx^2+cx+d
Use:(a-b)(a+b)=a^2-b^2\\\\(a+b)(c+d)=ab+ad+bc+bd\\\\a^n\cdot a^m=a^{n+m}
f(x)=(2x+1)(x+1)(x-1)\\\\f(x)=(2x+1)(x^2-1^2)\\\\f(x)=(2x+1)(x^2-1)\\\\f(x)=2x\cdot x^2-2x\cdot1+1\cdotx^2-1\cdot1\\\\f(x)=2x^3-2x+x^2-1\\\\\boxed{f(x)=2x^3+x^2-2x-1}
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