a. Cho da thuc P(x) = mx^2 + 2mx - 3 co nghiem x = -1. Tim m

b. Cho da thuc P(x) = ax^2 + bx + c. Chung to rang \(P\left(-1\right)\cdot P\left(-2\right)\le0\) biet rang 5a - 3b + 2c = 0

Tim nghiem cua cac da thuc sau:

a)\(f\left(x\right)=3x^2-4x-7\)

b)\(g\left(x\right)=2x^2+3x+1\)

c)\(h\left(x\right)=x^2+9x+14\)

d)\(k\left(x\right)=x^3+4x^2+5x+2\)

e)\(Q\left(x\right)=x^2-11x-102\)

Cho da thuc \(f\left(x\right)=x^3+2x^2+ax+1\)

TIm a biet no  \(f\left(x\right)=-2\)

Chung to neu a+b+c=0

thi da thuc \(A\left(x\right)^2\)=\(ax^2+bx+c\)

co 1 trong cac nghiem la 1

cho hai da thuc:

\(P\left(x\right)=2x^3-5x^2-3x^4+7-4x\)va \(Q\left(x\right)=-3+2x^4-x+x^3-5x^2\)

a)sap xep da thuc P(x) va Q(x) theo luy thua giam dan cua bien

b)tinh P(x) + Q(x) va P(x) - Q(x)

cho da thuc 

\(f\left(x\right)=a.x^2+b.x+c\)

xat dinh a, b, c biet\(f\left(-2\right)=0\),\(f\left(2\right)=0\)

va a>c

cho da thuc 

\(f\left(x\right)=a.x^2+b.x+c\)

xat dinh a, b, c biet\(f\left(-2\right)=0\),\(f\left(2\right)=0\)

va a>c

cho da thuc 

\(f\left(x\right)=a.x^2+b.x+c\)

xat dinh a, b, c biet\(f\left(-2\right)=0\),\(f\left(2\right)=0\)

va a>c