Solve using the quadratic
02 + 3r +3= 0
Asnwer

r= -5/3

Step-by-step explanation:

:Simplify both sides of the equation.

2+3r+3=0

(3r)+(2+3)=0(Combine Like Terms)

3r+5=0

3r+5=0

Step 2: Subtract 5 from both sides.

3r+5−5=0−5

3r=−5

Step 3: Divide both sides by 3.

3r

3

=

−5

3

r=

−5

3

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

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons