Question

Find minium value : (x+1).(x-3).(x+2).(x+6)​

Answer 1

(x+1).(x-3).(x+2).(x+6)

(X^2-3x+x-3).(x+2).(x+6)

(X^2-2x-3).(x+2).(x+6)

(X^3+2x^2-2x^2-4x-3x-6).(x+6)

(X^3+-7x-6).(x+6)

X^4+6x^3-7x^2-42x-6x-36

X^4+6x^3-7x^2-48x-36