Please write a quadratic trinomial about X so that the coefficient of the quadratic term is - 3, then the quadratic trinomial is ()

Please write a quadratic trinomial about X so that the coefficient of the quadratic term is - 3, then the quadratic trinomial is ()

Is - 3x & # 178; + 2x + 1

X / (x + 1) - x + 3 / (2x + 4) · 2x ^ 2 + 4x / (x ^ 2 + 6x + 9) reduction, where x = - 2

(2x+1)^2-9(x+2)(x-2)+5(x+1)(x-3)
=4x^2+4x+1-9(x^2-4)+5(x^2-2x-3)
=4x^2+4x+1-9x^2+36+5x^2-10x-15
=4x^2+5x^2-9x^2+4x-10x+1+36-15
=-6x+22
=-6*(-2)+22
=12+22
=34

Given (x + x 1 / 2) = 3, find the value of x 3 + x 3 1 / 3
= =+
I haven't learned the root number yet
= =+
Even though I can't understand it=
It's a long time
But that's it
=Can't = + be shorter

(x + 1 / x) ^ 2 = 3 leads to x + 1 / x = root 3
x^3+1/x^3=(x+1/x)(x^2+1/x^2-1)=(x+1/x)[(x+1/x)^2-3]=0
Please accept. Thank you~~~~
Let's start with the second line