См скриншот
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-4x^4+5x^2-1=0
4x^4-5x^2+1=0
x^2=a
4a^2-5a+1=0
D=25-16=9
a1=(5-3)/8=1/4⇒x^2=1/4⇒x=-1/2 U x=1/2
a2=(5+3)/8=1⇒x²=1⇒x=-1 U x=1
(-1;0),(-1/2;0)(1/2;0),(1;0)
(Z+5)(z^2-5z+25)=z^3-5z^2+25z+5z^2-25z+125=z^3+125
А) 3^2
2) 4^2x^2=(4x)^2
3) (2ab)^2
4) (5p^2)^2
5) (m^4n^3k^5)^2
6) (7a^2*2b^3*c^6)^2