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mamoon

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x^3 -ax^2+ax+5=0 >> -1^3 -(a * -1^2) + (a * -1) + 5 = 0

 

räknar ut det i paranteserna först

-1^3 -(a) + (-a) + 5 = 0 >>

-1 - a - a + 5 = 0 >>

-2a + 4 = 0 >>

4 + 0 = 2a

a=2

 

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