6x-10.2=0
6x=0+10.2
6x=10.2
x=10.2:6
x=1.7
Y=(x⁴-3)(x²+2)=x⁶-3x²+2x⁴-6
y`=(x⁶-3x²+2x⁴-6)`=6x⁵-6x+8x³=2x*(3x⁴+4x³.-3)
6х-4(2х+3)-7=6х+4(3х+2)+7
6х-8х-12-7=6х+12х+8+7
6х-8х-6х-12х=8+7+12+7
-20х=34
х=34:(-20)
х=-1.7
(3a-2)(3a+2)=(3a)²- (2)²=9а²-4
(c-2b)(c+2b)=(c)²-(2b)² = с²-4<span>b</span>²