Question

simplify that
(x+3)^3+(x-3)^3​

Answer 1

Step-by-step explanation:

we know a identity

(a + b )³ = a³ + b³ + 3a²b + 3ab²

and , ( a - b ) ³ = a³ - b³ - 3a²b + 3ab²

From this identity ..

we can write .. this equation like that

(x + 3)³ + (x - 3)³

= x³ + 3³ + 3×x²×3 + 3×3²×x + { x³ - 3³ - 3x²×3 + 3×3²×x

= x³ + 27 + 9x² + 27x + x³ - 27 - 9x² + 27x

= x³ + x³ + 27x + 27x

= 2x³ + 54x

= 2x ( x²+ 27 )

or, 2x ( x² + 3³)

Answer 2

Answer:

please refer to attachment