Question

Решите уравнение
-log15(4x-3)=log15 5-1

Answer 1

log₁₅(4x-3)⁻¹=log₁₅(5-1);
1/(4x-3)=4;
1/(4x-3)=(16x-12)/(4x-3);
64x²-48x-48x+36=4x-3;
64x²-100x+39=0;
D=16;
x≈0,81
x≈0,75