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√Δ=4
x₁=-2-4 / 2=-3
x₂=-2-4 / 2=1
y=(x+3)(x-1)
Δ=b² +4ac
Δ=2² - 4 × 1× (-3)
Δ= 4 +12
Δ= 16
x₁=(-b-√Δ ) ÷ 2a
x₁= (-2 -√16) ÷(2 ×1)
x₁= (-2 -4) ÷ 2
x₁= -6 ÷ 2
x₁= -3
x₂=(-b+√Δ ) ÷ 2a
x₂= (-2 +√16) ÷(2 ×1)
x₂= (-2 +4) ÷ 2
x₂= 2 ÷ 2
x₂= 1
y= 1(x+ 3)(x-1)
p= -b÷ 2a
p= -2 ÷ 2
p= -1
q = -Δ ÷ 4a
q= -16 ÷ 4
q= -4
w= ( -1, -4)