Verified answer

1) 16^4*(16+1)=16^4*17

38^8*(38-1)=38^8*37

2) (2х-7у)(3х²+5ху-2у²-3х²-2ху+2у²)=3ху(2х-7у)

(2х-7у)*3ху=3ху(2х-7у)

(3m-4)*(7n²-3n-5-7n²+3n+3)=8-6n

(3m-4)*(-2)=8-6n

-6n+8=8-6n

3) 4t³+t²=0

t²(4t+1)=0

t²=0

t1=0

4t+1=0

4t= -1

t2= -1/4

2a²-5a=0

a(2a-5)=0

a1=0

2a-5=0

2a=5

a=5:2

a2=2,5

(х-7)(1+х)=0

х-7=0

х1=7

1+х=0

х2=-1