balancebypaloma
Calculators
General
Algebra
Geometry
Coordinate-geometry
Statistics
Calculus
Qna
Math
balancebypaloma
balancebypaloma
Home
General
Algebra
Geometry
Coordinate-geometry
Statistics
Calculus
Qna
Math
MATH SOLVE
Home
General
11. Solve for x: x3 + 3x2 + 3x + 2 = 0
4 months ago
Q:
11. Solve for x: x3 + 3x2 + 3x + 2 = 0
Accepted Solution
A:
Answer: x = -2, (-1 + √3 i ) / 2 , (-1 - √3 i) / 2.Step-by-step explanation: x^3 + 3x^2 + 3x + 2 = 0f(-2) = -8 + 3*4 - 6 + 2 = -8 + 12 - 6 + 2= 0So (x + 2) is a factor . Dividing: x^2 + x + 1 ---------------------------------x + 2) x^3 + 3x^2 + 3x + 2 x^3 + 2x^2 ---------------- x^2 + 3x x^2 + 2x ----------- x + 2 x + 2. ----------Solving x^2 + x + 1: x = [ - 1 +/- sqrt(1 - 4*1*1) ] / 2 = (-1 + √3 i ) / 2 , (-1 - √3 i) / 2.