\(\left(x+3\right)\left(x^2-3x+9\right)-x\left(x^2-2\right)=15\)
\(\Leftrightarrow x^3+27-x^3+2x=15\)
\(\Leftrightarrow2x=-12\)
\(\Leftrightarrow x=-6\)
Bài 2: Tìm x, biết: a) (x+2)(x² -2x+4)-x(x²+2)=15 b) (x-2)³-(x-4)(x² + 4x+16) + 6(x+1)=49 c) (x - 1)³ + (2 - x)(4 + 2x + x²)+ 3x(x + 2) = 16 d) (x - 3)³ - (x - 3)(x² + 3x + 9) + 9(x + 1)² = 15
tìm x biết:(x+3)(x^2-3x+9)-x(x-2)(x+2)=15
Tìm x biết:
a) ( x – 3 ) 3 – ( x – 3 ) ( x 2 + 3 x + 9 ) + 9 ( x + 1 ) 2 = 15;
b) x(x – 5)(x + 5) – (x + 2)( x 2 - 2x + 4) = 3.
Tìm X biết:
(x-3)2 - (x-3)(x2+3x+9) + 9(x+1)2=15
tìm x biết
(5x+1)^2 - (5x+3).(5x-3)=30
(x+3).(x^2-3x+9)-x.(x-2).(x+2)=15
tìm x biết:(x+2)3-(x-3)(x2+3x+9)+6(x+1)2=15
Rút gọn
(x^4-3x^2+9).(x^2+3)-(3+x^2)
(x-3)^3-(x-3).(x^2+3x+9+6.(x+1)^2
Tìm x
(x-2)^3-(x-3).(x^2+3x+9)+6.(x+1)^2=49
(x+2).(x^2-2x+4-x.(x^2+2)=15
Tìm x biết
a/3x*(12*x-4)-9*x*(4x-3)=30
b/x*(5-2*x)+2*x*(x-1)=15
Bài 2: Tìm x, biết
a) (x+3) mũ 2 - (x-4)(x+8) = 1
b) (x+3)(x mũ 2 - 3x + 9) -x(x-2)(x+2) = 15
c) (x-2) mũ 2 - (x+3) mũ 2 - 4(x+1) = 5
d) (2x-3)(2x+3) - (x-1) mũ 2 - 3x(x-5) = -44
e) (x-2) mũ 3 - (x-3)(x mũ 2 + 3x + 9) + 6(x+1) mũ 2 = 49
f) 5x(x-3) mũ 2 - 5(x-1) mũ 3 + 15(x+2)(x-2) = 5
g) (x+3) mũ 3 - x(3x+1) mũ 2 + (2x+1)(4x mũ 2 - 2x + 1) - 3x mũ 2 = 42
