42)16х²-1=(4х-1)(4х+1)
43)t²-p²=(t-p)(t+p)
44)a²-25b²=(a-5b)(a+5b)
45)49z²-121t²=(7z-11t)(7z+11t)
46)144y²-81=(12y-9)(12y+9)
47)a²d^6 -9=(ad³-3)(ad³+3)
48)x⁴y⁴-1=(x²y²-1)(x²y²+1)
49)(a+k)²- (a-k)²=((a+k)-(a-k))((a+k)+(a-k))=(a+k-a+k)(a+k+a-k)=(2k)(2a)=4ak
50)25t²-(2z+3t)²=(5t-(2z+3t))(5t+(2z+3t))=(5t-2z-3t)(5t+2z+3t)=(2t-2z)(8t+2z)= 2(t-z)2(4t+z)=4(t-z)(4t+z)
вроде так)))))