Satterly475 Satterly475

13-05-2014
Mathematics

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(3x + 2) (2x - 5) = ax² + kx + n .
What is the value of a - n + k ?

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13-05-2014

[tex](3x + 2) (2x - 5)=ax^2+kx+n \\ \\ =3x\cdot 2x - 3x\cdot 5 +2\cdot 2x - 2\cdot 5=\\ \\=6x^2-15x+4x-10=\\ \\=6x^2-11x-10\\ \\ a=6, \ n=-10 , \ k=-11 \\ \\a - n + k = 6-(-10)+(-11)=6+10-11= 5[/tex]

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