1)(2х^2+4ах)-(3х+6а)= 2х(х+2а)-3(х+2а)= (2х-3)(х+2а)
2)(4а+ау)+(by+4b)= a(4+y)+b(y+4)= (a+b)(y+4)
8sin²x+sinxcosx+cos²x-4sin²x-4cos²x=0
4sin²x+sinxcosx-3cos²x=0/cos²x
4tg²x+tgx-3=0
tgx=a
4a²+a-3=0
D=1+48=49
a1=(-1-7)/8=-1⇒tgx=-1⇒x=-π/4+πn
a2=(-1+7)/8=3/4⇒tgx=0,75⇒x=arctg0,75+πk,k∈z
2^x*5^x=10^(-1)*(10^((x-1)*3))
10^x=10^(-1)*10^(3x-3)
10^x=10^(3-3x)
x=3-3x
4x=3
x=0.75