6х²+5mx+m²=0
a=6
b=5m
c=m²
D=b²-4ac = 25m² - 24m² = m²
x₁ = -b-√D / 2a = -5m-m / 12 = - m/2
x₂ = -b+√D / 2a = -5m+m / 12 = - m/3
У=кх+b
A (0; 4)
y=0×k+b
4=0+b
b=4
B (-2; 0)
0=-2×k+4
-2k=-4
k= 2
y=2x+4
Ответ: b=4; k=2
1) (с³-5cd-3d)+(c³+5d+8cd)= c³-5cd-3d+c³+5d+8cd= 2c³+2d+3cd
2) (-5y-4x⁴-2x²y)+(-5x²y-6y-5x⁴)= -5y-4x⁴-2x²y-5x²y-6y-5x⁴=-11y-9x⁴-7x²y
3) (-2m²+3n+6mn²)-(2mn²+3n+m²)= -2m²+3n+6mn²-2mn²-3n-m²=-3m²+4mn²