1) -7х^10+х^15 = х^10*(-7+х^5)
2) 4аb + 26 b^2 = 2b*(2a+13b)
3) 78d^2 n^3 + 6d^4 n - 18d^3 n^2 = 6d^2n*(13n^2 + d^2 - 3dn)
Ответ:
x=8
Объяснение:
x²-x-56=0
13x+91≠0
x≠ -7
D=1+224=225
x1= (1+15)/2= 8
x2= (1-15)/2= -7 - не корень
(a²-3a)/(a²+3a-18)=a(a-3)/(a-3)(a+6)=a/(a+6)
d=9+72=81
a12=(-3+-9)/2=-6 3
(4x²-8x+3)/(4x²-1)=(2x-1)(2x-3)/(2x-1)(2x+1)=(2x-3)/(2x+1)
в=64-48=16
х12=(8+-4)/8=1/2 3/2
(m²+4m-5)/(m²+7m+10)=(m+5)(m-1)/(m+5)(m+2)=(m-1)/(m+2)
d1=16+20=36
m12=(-4+-6)/2=-5 1
d2=49-40=9
m12=(-7+-3)/2=-5 -2