6x^2+15x-54=0
D=225+1926=1521
x1=(-15+39)/12=24/12=2
x2=(-15-39)/12= -54/12= -4,5
6x^2+15x-54=6(x-2) (x+4,5)
6x^2+21x-27=0
D=441+648=1089
x1=(-21+33)/12=12/12=1
x2=(-21-33)/12= -54/12= -4,5
6x^2+15x-54=6 (x-1)(x+4,5)
4c^2-4c+c^2-c^2-4c=4c^2-8c
4c^2-8c при с =0,5
<span>4*0,5^2-8*0,5=2^2-4=4-4=0</span>
<span>1) 3(2а+b-8c) = 6a+3b-24c.
2) -4(-x+3y-4z) = 4x-12y+16z.
3) (m-5n-6k)(-1,4) = -1,4m+7n+8,4k.
4) -0,8t(4p-5L-1,2) = -3,2tp+4tl+0,96t.
5) (-a+3,4b+3c)(-d) = ad-3,4bd-3cd.</span>
F(x)=∫ 4sin(2x+π/4) dx= -4*1/2*cos(2x+π/4)+C=-2*cos(2x+π/4)+C