Y'=3x^2 -6x-9
3x^2 - 6x -9=0
x^2 -2x-3=0
D=4+12=16
x1=(2+4)/2=3
x2=(2-4)/2=-1
§1.5p+2/ 5p+2p²-q² +5q+2=
q²-p²
_--------------------------------------------
=5p+2/ 5p+(p-q)*(p+q)+5q+2=
(q-p)*( q +p)
---------------------------------------------
=5p+2/5p+5q+2=5q
------------------------_--------------------
§2.m+n-2mn=-2mn
m+n
Sinkv a + coskv a =1
coskv a = 1-sinkv a
9 +5.sinkva -5(1-sinkv a)
9+5.sin kv a -5 + 5.sinkv a = 10 sinkv a +4