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Maksim231197 [3]
3 years ago
8

(x-1)(x-3)(x+5)(x+7)=297

Mathematics
2 answers:
Assoli18 [71]3 years ago
7 0

Answer:

x=4

Step-by-step explanation:

(4-1)(4-3)(4+5)(4+7)=297

mihalych1998 [28]3 years ago
5 0

First simplify the expression into polynomial form,

(x-1)(x-3)(x+5)(x+7)=297

x^4+8x^3-10x^2-104x+105=297

x^4+8x^3-10x^2-104x-192=0

Now factor into,

(x-4)(x+8)(x^2+4x+6)=0

Which means the solutions are,

x-4=0\implies\boxed{x_1=4}

x+8=0\implies\boxed{x_2=-8}

and then two complex solutions because determinant of the third factor D\lt0,

x^2+4x+6=0

x^2+4x+4=-2

(x+2)^2=-2\implies\boxed{x_3=i\sqrt{2}-2},\boxed{x_4=-i\sqrt{2}-2}

Hope this helps :)

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