(5-b)^3 = 125 - 3*25*b + 3*5*b^2 -b^3 = 125-75b+15b^2-b^3
(y+3)^3 = y^3 + 3*3*y^2+ 3*9*y + 27 = y^3+ 9y^2+27y+27
<span> f(x)=-2x+3</span>
<span>f(x)=0</span>
<span>-2x+3=0</span>
<span>-2x=-3(2x=3)</span>
<span>x=3/2</span>
x=3
S₁₁ = (a₁ + a₁₁)*11/2
22 = (a₁ + 92)*11/2
a₁ + 92 = 4
a₁ = -88
a₁₁ = a₁ + 10d
92 = -88 + 10d
10d = 180
d = 18
<span>2 sin² 4x-4(sin^2x+cos^2x)=3sin 4x cos4x-4 cos² 4x</span>