Factorise 343m^3 + 27n^3​

m3+27n3

Step-by-step explanation:

Rewrite

27

n

3

as

(

3

n

)

3

.

m

3

+

(

3

n

)

3

Since both terms are perfect cubes, factor using the sum of cubes formula,

a

3

+

b

3

=

(

a

+

b

)

(

a

2

−

a

b

+

b

2

)

where

a

=

m

and

b

=

3

n

.

x is variable or an unknown value to find

example:

2x = 5 which means x = 3

a. she will receive a refund of $278.

step-by-step explanation: