A² - 2ab + b² - c² = (a² - 2ab + b²) - c² = (a - b)² - c² = (a - b - c)(a - b + c)
Х^4+2x^2-8=0
x^2=y
y^2+2y-8=0
D=2²-4*1*(-8)=4+32=36 (6)
y1=-2+6\2=4\2=2
y2=-2-6\2=-8\2=-4
x^2=y x^2=y
x^2=2 x^2=-4-не имеет значения
x=+-√2
Ответ:х=√2,х=-√2
(log₂32+lne-lg100=log₂2⁵+1-lg10²=5+1-2=4.
(log₂(√5-1)+log₂(√5+1))*log₃49/log₃7=log₂((√5)²-1²)*log₃7²/log₃7=
(log₂4)*2=2*log₂2²=2*2=4.
*+2*15m³n²+(3n²)²=25m⁶+30m³n²+9n⁴
a⁴+0,8a⁶+*=a⁴+2*0,4a²a⁴+0,16a⁸
5/6-10/27*3/5
-10*3/27*5+5/6
-30/135+5/6
-2/9+5/6
-4+15/18
11/18
0.6111111
Ответ: 0.6111111