Can anyone answer this Factor f(x)=x2−8x+16

(A) (x−4)2
(B) (x+8)2
(C) (x−8)2
(D) (x+4)2

Which trinomial is a perfect square trinomial?

(A) y2+6y+36
(B) y2+25y+200
(C) y2+18y+81
(D) y2+36y+60

Factor 4x2+36x+81

(A) (2x+9)(2x−9)
(B) (4x+9)2
(C) (2x−9)2
(D) (2x+9)2

Which expression is a factor of 16x2−81?

(A) 4x−9
(B) 8x−9
(C) 4x−81
(D) 8x−81

Factor f(x)=x2−6x+9

(A) (x−9)2
(B) (x−3)2
(C) (x+9)2
(D) (x+3)2

how you don't know this the answer is C

Step-by-step explanation:

the value of v.w= -12.

step-by-step explanation:

we are given three vector r,v and w as:

r = < 5, -5, -2> ; v = < 2, -8, -8> ; w = < -2, 6, -5>

we know that r,v and w could also be represented as:

r=5i-5j-2k

v=2i-8j-8k

and w= -2i+6j-5k

where i,j and k are the unit vectors of x,y and z-axis respectively.

also we know that it has the following property:

i.i=1 ; j.j=1; k.k=1

and i.=j.i=i.k=k.i=j.k=k.j=0

i.e. when we multiply two vectors or we find it's dot product we need to only multiply the components of x coordinates with each other; y with each other and z with each other.

hence, v.w= (2i-8j- -2i+6j-5k)

                  = 2×(-2)+(-8)×(6)+(-8)×(-5)

                  = -4-48+40

                  = -12

hence, v.w= -12

i think it is c, not positive though

step-by-step explanation: