myg21
27.07.2019 •
Mathematics
Démontrer que x²-4x+5=(x-2)²+1 ; en déduire que x²-4x+5=0 n'a pas de solution
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Ответ:
tous les nombres réels
2nd: résoudre l'équation pour x en trouvant a, b et c du quadratique puis en appliquant la formule quadratique
x = 2 ± i
Ответ:
see explanation
step-by-step explanation:
since the sequence is geometric there is a common ratio r between consecutive terms, that is
r = 4 ÷ - 2 = - 2
r = - 8 ÷ 4 = - 2
r = 16 ÷ 8 = - 2
the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.
the first 4 terms are therefore geometric with common ratio r = - 2