(x+3)^2=2x+6
x^2+6x+9=2x+6
x^2+4x+3=0
D=16-12=4;2
x1=((-4)+2)/2=-1
x2=((-4)-2)/2=-3
Q=a2/a1
q=-1/3:1/9=-1/3*9/1=-2
an=a1*q^(n-1)
an=1/9*(-3)^(n-1)
P = 30 м; S = 56 м²;
2*(a + b) = 30 => a + b = 15;
a * b = 56;
a = 15 - b; => (15-b) * b = 56 => b² - 15b + 56 = 0; b1 = 7; b2 = 8;
a1 = 15 - 7 = 8;
a2 = 15 - 8 = 7;
Ответ: длины сторон 7м и 8м
1) 3⁶ +3⁶ +3⁶=3*3⁶=3¹⁺⁶ =3⁷
2) 2*2³ =2¹⁺³ =2⁴
3) 3*3⁴ =3¹⁺⁴ =3⁵