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Δ=49+4*3*6=49+72=121
√Δ=11
x=(7-11)/6 = -2/3
x=(7+11)/6 = 3
odp. x=0 lub x=-2/3 lub x=3
2.
2.
3.
4.
5.
odp. x∈(-∞; -1)u(3/4 ; ∞)
6.
zbiór wartości funkcji Y= (-25/16; +∞)
wierzchołek: p= -3/8
q=-(9+16)/16=-25/16
W = (-3/8 ; -25/16)
7. sin²α+cos²α = 1 , zakładam, że α to kąt ostry
9/16 + cos²α =1
cos²α = 7/16
cosα=(√7)/4
tgα=sinα/cosα = 3/4 *4/√7 = 3/√7
ctgα=1/tgα = √7 / 3