Question

X = 3 root 28 and y = 3 root 27 find x+y -1 divided by x square +xy + y square

Answer 1

Answer:

so answer is 3. pls pls mark brainliest:-)

Step-by-step explanation:

here we use (x³-y³) formula.

(x³-y³)=(x-y)(x²+y²+xy)

so 1/(x²+y²+xy)=(x-y)/(x³-y³)

so substituting, we get the above expression to be

x+y-(x-y)/(x³-y³)

in denominator I'm putting x equals cube root 28 and y equals cube root 27.

so it becomes,

x+y-(x-y)/(28-27)=x+y-x+y=2y

= 2(27^1/3)=2×3=6