Odpowiedź:
0 = -3/4 (x²+3/5x+2/3x+2/5) |÷(-3/4)
0 = x² + 9/15x + 10/15x + 2/5
x² + 19/15x + 2/5
delta = 361/225 - 4×1×2/5
delta = 361/225 - 8/5
delta = 361/225 - 360/225
delta = 1/225
pierwiastek z delty = 1/15
x1 = (-19/15 + 1/15) / 2
x1 = - 18/30
x1 = - 3/5
x2 = (-19/15 - 1/15) / 2
x2 = (-20/15) / 2
x2 = (-4/3) /2
x2 = - 2/3
odp.: miejsca zerowe wynoszą (-3/5) i (-2/3)
