A=1 b=8 c=12
d=8^2-4*1*12=64-48=16
√16=4
x1=-8-4\2=-6
x2=-8+4\2=-2
ответ:-2
a₁=-16 S₁₇=544 d=?
Sn=(a₁+an)*n/2
S₁₇=(-16+(-16+16*d)/17/2=544
(-32+16d)*17/2=544
(-16+8d)*17=544 |÷17
-16+8d=32
8d=48 |÷8
d=6.
Ответ: d=6.
A1=12
a14=-27
S14=a1+a14*14=12+(-27)*14=273
2. 2
=√16ab²=√16*√a*√b²=4√a*|b|=4√a8(-b)=-4b√a
F(x) = 7x⁶ + x³ + 4x + 2
f '(x) = (7x⁶)' + (x³)' + (4x)' + (2)' = 42x⁵ + 3x² + 4