Nº1. N93.
a) 5x® + 2x = 0;
b) 3x - 6x = 0.
c) 2x -4 = 0;
d) 5x + 3 = 0.
e) 12x = 0
f) -5x = 0.
Nº2.
a) x + 2x = 0
b) 3x+445x = 0.
c) 3x-27=0
d) 2x® + 5 = 0.
e) -2x = 0;
f) 8x = 0.
a) 3x +9x = 0;
b) x-7x=0.
c) 2x-8= 0;
d) x + 15 = 0.
e) 6x’ = 0;
f) 3x = 0.
Решите уравнения
= =
x² + 7x - 18 (x - 2) (x + 9) x + 9.
x²+7x-18 = 0 a=1;b=7;c=-18 D = b² - 4ac D = 49 + 72 = 121 (11). x₁ = -b+√D/2a = -7+11/2 = 4/2 = 2.
x₂ = -b -√D/2a = -7 - 11/2 = -18/2 = -9.
ax² + bx + c = a(x - x₁)(x - x₂) = (x - 2) (x + 9).