Question 61 point Amazon is having a sale. The price of hardback books is $8.50 and the price of paperback books is $3.75. Write an algebraic
expression that can be used to find the total amount of money spent on books on Amazon. Suppose Angela buys 4 hardback
books and 1 paperback book. Find the total amount she spent on Amazon.
Expressin:

Units:
Word Bank
3.5h -8.5 22.50 42.50 8.5h +3.755 dollars
37.75 cents
elephants 8.5h + 3.5

it shoild be o

step-by-step explanation:

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)

step-by-step explanation: