25х²у²-4х⁴ = х²(25у²-4х²) = х²(5у-2х)(5у+2х)
45-30а+5а = 45-25а = 5(9-5а)
(2х-3)(2х+3)=4х(х+1)-1
4х²-9=4х²+4х-1
4х²-9-4х²-4х+1=0
-9-4х+1=0
-8-4х=0
4х=-8
х=-2
25х²у²-4х⁴ = х²(25у²-4х²) = х²(5у-2х)(5у+2х)
45-30а+5а = 45-25а = 5(9-5а)
(2х-3)(2х+3)=4х(х+1)-1
4х²-9=4х²+4х-1
4х²-9-4х²-4х+1=0
-9-4х+1=0
-8-4х=0
4х=-8
х=-2