Odpowiedź:
A)
16 - x^2 = 0
x^2 = 16 /√
x = 4
B)
4x²+8x=0
Δ = 8^2 - 4(4*0) = 64
√Δ = 8
x1 = (-8 - 8) /2 = -8
x2 =(-8 + 8)/2 = 0
c)
2x²-14x-12=0
Δ = 196 - 4(2*-12) = 100
√Δ = 10
x1 = [- (-14)- 10]/4 = -6
x2 = [- (-14)+ 10]/4 = -1
Szczegółowe wyjaśnienie: