Объяснение:
-9(-13t-8)²=-63 |-9
169t²+208t+64=7
169t²+208t+64-7=0
169t²+208t+57=0; D=43264-38532=4732
t₁=(-208-26√7)/338=(-8-√7)/13=-8/13 -(√7)/13
t₂=(-208+26√7)/338=(√7 -8)/13=(√7)/13 -8/13
ответ: -8/13 -(√7)/13 и (√7)/13 -8/13.
Объяснение:
-9(-13t-8)²=-63 |-9
169t²+208t+64=7
169t²+208t+64-7=0
169t²+208t+57=0; D=43264-38532=4732
t₁=(-208-26√7)/338=(-8-√7)/13=-8/13 -(√7)/13
t₂=(-208+26√7)/338=(√7 -8)/13=(√7)/13 -8/13
ответ: -8/13 -(√7)/13 и (√7)/13 -8/13.