plzz answer plzzz 40 points
answer all I will give brainliest please
Answers
Answer:
Step-by-step explanation:
1. given -4 is a root of the equation.
(-4)^4+a(-4)^3-19(-4)^2-46(-4)+120=0
256-64a^3-19*16+184+120=0
256-64a^3-304+184+120=0
64a^3=256
a^3=4
a=4^1/3
just check the options
2. k(2^4)-11(2^3)+k(2^2)+13*2+2=0
16k-88+4k+26+2=0
20k-88+28=0
20k=60
k=3
3.
-3x/2+1)x^3-6x^2+2x-4(-2x^2/3+32x/9+28/27
x^3-2x^2/3
---------------------------------
-16x^2/3+2x
-16x^2/3+20x/9
---------------------------------------------------------
-14x/9-4
-14x/9+28/27
---------------------------------------------------------------------
-136/27
4. x+1 and x-1 are factors of x^2+2ax+b
f(1)=1+2a+b=0
2a+b=-1---(1)
f(-1)=1-2a+b=0
b-2a=-1--(2)
2b=-2
b=-1
a=0
2a+3b=2*0+3*-1=-3
5. (x-1)(x+2)(x-2) are factors of x^3+ax^2+bx+c
f(1)=1+a+b+c=0
a+b+c=-1
6. length*breadth=area
length=area/breadth
2x-y)2x^2+3xy-2y^2(x+2y
2x^2-xy
-----------------------------
4xy-2y^2
4xy-2y^2
-----------------------------
0 =remainder
so length is x+2y
Answer: