Question

if 3x+ 2y =8 and xy = 2 evaluate the value of 27 x^3 + 8y^3

Answer 1

Step-by-step explanation:

Given 3x+2y=8

& xy=2

Now,

let the value of x be 2

then 3x+ 2y = 8

= 3×2+2y=8

=6+2y=8

=2y=8-6

=2y=2

=y=2/2

=y=1

now by applying the value of x and y in 27x³+8y³

=27 × 2³ + 8 × 1³

= 27 × 8 + 8 × 1

= 216+8

=224

therefore the value of 2x³+8y³ is 224