Question

Solusi (x,y) dari sistem persamaan line ae kuadrat
y=x+2
y=x2-9

Answer 1

y=x+2
y=x²-9

    y = y
x+2 = x²-9
    0 = x²-x-11

rumus abc:
x₁ = (-b + √b²-4ac)/2a
    = (1 + √1-4.1.(-11))/2
    = (1 + √45)/2
    = (1 + 3√5)/2

x₂ = (-b - √b²-4ac)/2a
    = (1 - √1-4.1.(-11))/2
    = (1 - √45)/2
    = (1 - 3√5)/2