Question

pls answer 3rd question. this is urgent

I will mark as brainlist

Answer 1

Hey friend,

Here is your answer,
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4x + 5z = 19                  xz = 5

(4x+5z)³ = 19³

(4x)³ + (5z)³ + 3xz(4x+5z)  = 19³               {Formula used :- a+b}³ = a³+b³+3ab(a+b)

64x³ + 125z³ + 3*5*19 = 6859

64x³ + 125z³ + 285 = 6859

64x³ + 125z³ = 6859 - 285

64x³ + 125z³ = 6574

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Hope this helped you !!
Please mark as brainliest !!

Answer 2

it is written as (4x)³+(5z)³
since acube +bcube = (a+b)((a+b)²-ab)
now put values