Cho da thuc p(x)= 6x^2-5x-1
q(x)= -2x^4+4x^3-3x^2+x
Tim nghiem Chung cua 2 da thuc
Cho 2 da thuc A= 2x^3 + x^2 - 4x +x^3 + 3 ; B= 6x + 3x^3 -2x + x^2 - 5
a, Tinh tong hai da thuc A+B
b, Tinh hieu hai da thuc A-B
c, tim nghiem cua da thuc hieu A - B vua tim duoc o y b.
Cho da thuc A=\(x^4+6x^2+8x^3-2x-3\);B=\(3x^2+x^4+4x^3-3x+5\)
Ting A-2B
Cho da thuc \(f\left(x\right)=x^3+2x^2+ax+1\)
TIm a biet no \(f\left(x\right)=-2\)
Bai 4: Xac dinh he so m de cac da thuc sau nhan 1 lam nghiem
a,mx\(^2\)+2x+8 b, 7x\(^2\)+mx-1 c, x\(^5\)-3x\(^2\)+m
Bai5: Cho da thuc f(x)=x\(^2\)+mx +2
a, Xac dinh m de f(x) nhan -2 lam 1 nghiem
b, Tim tap hop cac nghiem cua f(x) ung voi gia tri vua tim duoc cua m
Bai 6: Tim da thuc f(X) roi tim nghien cua f(x) biet
\(x^3+2x^2\left(4y-1\right)-4xy^2-9y^3-f\left(x\right)=-5x^3+8x^2y-4xy^2-9y^3\)
Tim da thuc M biet : M+(5x^2-2xy)=6x^2+9xy-y^2 . Giup minh voi .
a,tim a biet da thuc A(x)=ax2- 1/2x +1 co 1 nghiem la -1/2
b, tim a,b cua da thuc :B(x)= ax2+bx+5 biet B(1)=6 va B(-2) = 15
c, cho da thuc C(x)= ax+b .Tim a,b biet :
x=4 la nhgiem cua C(x)va C(2)=1
tim nghiem cua da thuc sau
\(x^2-6x+14\)
M(x)\(=3x^3+2x^2_{ }-7x+3x^2-x^3+6\)
N(x)\(=3+4x^3+6x^2+3x-x^2-2x^3\)
a) thu gon da thuc M(x), N(x)
b)tinh M(x)+N(x)