b. write an equation where a number is multiplied by a variable, and a solution is -4/5

The needed equation is :

Step-by-step explanation:

A variable is defined as the UNKNOWN quantity whose value is determined on the basis of equation in which it is used.

A number or CONSTANT is defined as the KNOWN quantity whose value is NOT BASED on the basis of equation in which it is used.

Foe example C = 3, 5 ,-9,0 ...

Here, let us assume here the variable = m

And let us assume a number to be a CONSTANT C.

So, here Constant number C  is multiplied with variable, we get :  C x m

Also, the resultant is (-4/5)

So, The statement : a number is multiplied by a variable, and a solution is -4/5 is written as:

Hence the needed equation is

hello from mrbilldoesmath!

answer:   (7x + 6y) ( 49x^2 - 42xy + 36y^2)

discussion:

in general, the factorization of a^3 + b^3 is

a^3 + b^ 3 = (a + b) ( a^2 - ab + b^2)

in our case note that 343 = 7^3 and 216 = 6^3 so the equation becomes:

343x^3 + 216y^3 = (7x)^3 + (6y)^3

if you think of a (above) as 7x and b as 6y the factorization becomes

343x^3 + 216y^3 =

((7x + 6y) (   (7x)^2 - 7x*6y + (6y)^2)   =

(7x + 6y) ( 49x^2 - 42xy + 36y^2)

you,

mrb

(a + b) (a^2 - a b + b^2)

you a real one for tat answer

step-by-step explanation: