А) 16х^2+24х+9-24х=16х^2+9
б) с^2+12с+36-с^2-12с= 36
в) 25х^2-4у^2-24х^2+6у^2= х^2+2у^2
г) 18с^2-9с^2+6с-1=9с^2+6с-1
B1=1,2 , q=4, b3=?
b3=b1.q²
b3=1,2.4²=1,2.16=19,2
b3=19,2
=========
(3х-8)²+(4х-8)*(4х+8)+100х=
=9х²-48х+64+16х²+32х-32х-64+100х=
=25х²+52х=
=х*(25х+52)
3х² + 9х = 0
3х(х + 3) = 0
3х = 0 или х + 3 = 0
х = 0 х = -3
.................................................................................................................
2х² - 18 = 0
2х² = 18
х² = 18/2
х = +-√9
х1 = 3 х2 = - 3
......................................................................................................................
4х² = 0
х² = 0
х = 0