8)(16А^2-b^2)
9)(5-3x)(25+15 x 9x^2)
10)(2d+4c^2)(4d^2+8c^2d+16c^4)
11)36c^2+84c+49
12)(5m-2)(5m+2)
13)100a^6-100a^3b+25b^2
14)(5x-4)(25x^2+20x+16)
15)(t+6)(t^2+6^t+36)
16)4t^2+4t+1
17)a^4-6a^2x+9x^2
18)9x^2-25y^2
19)(x-4)(x^2+4x+16)
20)x^3+27
21)9x^2+6x+1+16x^2-9=25x^2-10x
6x+10x=9-1
16x=8
x=0.5
22)125x^2+64-64=500+64-64=500
23)x^2-64+8x^2=30x+25+1
-30x=90
x=-3
24)(6x-y)(6x+y)-1
25)(3-p)(9+3p+p^2)