решите уравнение
1)(3х-2)^2-(3x-1)(3x+1) равно -2х
2)25а^2-81 равно 0
ПОМАГИТЕ
1)(3х-2)^2-(3x-1)(3x+1) равно -2х
2)25а^2-81 равно 0
ПОМАГИТЕ
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(3x-2)² -(3x-1)(3x+1)= -2x9x²-12x+4 - 9x²+1+2x=0
-10x+5=0
10x=5
x=5:10
x=0.5
25a² -81=0
(5a+9)(5a-9)=0
5a+9=0
5a= -9
a1= - 1.8
5a-9=0
5a=9
a=9:5
a2=1.8