Question

1 Rezolvati ecuatiile :

a) logaritm in baza 3 din (2x^2-5x+3)=0

b) 2 la puterea x+1 -5 inmultit cu 2 la puterea x +2 =0

Answer 1

Răspuns

Explicație pas cu pas:

$log_3 (x^2-5x+3)=0\\\\log_3(x^2-5x+3) = log_3(1)\\\\x^2-5x+3 = 1\\x^2-5x+2 = 0\\\\x_1 = 2\\x_2 = 1/2\\\\b)\\2^{x+1}-5*2^{x+2}=0\\2^{x}(2-5*4)=0\\\\\\-18*2^x=0$

nu are solutie in R