Изображен график 4 функции
y=-x²-10x-27
при x=-5
y=-25+50-27=2
<span>(3х –2)(3х + 2) –(3х -4)^2= -68.
9x^2-4-9x^2+24x-16=-68
24x-20=-68
24x=-48
x=-2
</span>
Вроде так)
cos^2x-3sinxcosx=-1
cos^2x-3sincos+sin^2+cos^2=0
2cos^2+sin^2-3sincos=0
2+tg^2-3tg=0
D=1
X1,2= 2;1
tgx=2 tgx=1
x=arctg2+pk x=p/4+pk
x=p-arctg2+pk
<span>log_5 (4x + 5) = 2+ log_5 (x - 4)
</span>log_5 (4x + 5) = log_5 (25) + log_5 (x - 4)
log_5 (4x + 5) = log_5[ (25) * (x - 4)]
4x + 5 = (25) * (x - 4)
4x - 25x = -100 - 5
- 21x = - 105
x = 5