14x^2 - 9x^2 + 9x - 4 =0
5x^2 + 9x - 4 =0
D =81 - 80 =1 x1 =(-9+1)/10 = -0,4 x2 = (-9-1)/10 = -1
1) (-pi/4;pi/4)
2) (pi/4;3pi/4)
<span> (а+5b/a^2-5аb - а-5b/a^2+5аb) * 25b^2-a^2/5b^2.=
((a+5b)^2-(a-5b)^2)/(a*a^2-25b^2)*(25b^2-a^2)/5b^2)=-4*5ab/(a*5b^2)=-4/b=-4/(-2)=2
</span>
y=-3x+6
a) oc x : y=0
-3x+6=0, 3x=6, x=2 , X(2,0)
b)oc y: x=0
y=-3×0 +6=0+6=6 , Y(0,6)