Question

Log7^2x-3Log7x+4=4 график функций

Answer 1

log₇²x - 3log₇x + 4 = 4
log₇x = t
t² - 3t = 0
t (t - 3) = 0
t = 0     или     t - 3 = 0
                        t = 3
 1) t = 0
log₇x = 0
x = 1
2) t = 3
log₇x = 3
x = 7³ = 343 

Answer 2

log₇²x - 3log₇x + 4 = 4 log₇x = t t² - 3t = 0 t (t - 3) = 0 t - 3 = 0 t = 3 1) t = 0 log₇x = 0 x = 1 2) t = 3 log₇x = 3 x = 7³ = 347