Question

Urgent va roggggg!!!!!!!

Answer 1

Răspuns:

Explicație pas cu pas:

1b) -3 -log2(2^-3) = -3 +3= 0

c) lg250*4 = lg1000 = lg10^3 = 3

d) log6(8*9) -log6(2) = log6(72/2) = log6(6^2) = 2

2a) 2x +3 = 25,  2x = 22,  x = 11

b) 2x -1 = 3^3=27,  2x -2 = 26,  x = 13

c) 5^(3x -7) = 5^2

3x -7 = 2,   3x = 9,   x = 3

d) log2(x^2 +7) = log3(2^3)

x^2 +7 = 8,   x^2 = 1,  x = -+1, x1 = -1,  x2 = 1

e) 5^(x^2 -5x +7) = 125 = 5^3

x^2 -5x +7 = 3

x^2 -5x +4 = 0

(x-1)(x -4) = 0,  x1 = 1,  x2 = 4

etc.