Question

Give answer..........

Answer 1

Here is you answer

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Answer 2

iii) (2x + 5)³

Since, (x + y)³ = x³ + 3x²y + 3xy² + y³

Here, x = 2x, y = 5

By substituting the values :

= (2x)³ + 3(2x)²(5) + 3(2x)(5)² + (5)³

= 8x³ + 15(4x²) + 6x(25) + 125

= 8x³ + 60x² + 150x + 125

iv) x³ - 5³

Since x³ - y³ = (x - y)(x² + xy + y²)

Here, x = x, y = 5

By substituting the values :

= (x - 5){(x)² + x(5) + (5)²}

= (x - 5)(x² + 5x + 25)

= x(x² + 5x + 25) - 5(x² + 5x + 25)

= x³ + 5x² + 25x - 5x² - 25x - 125

= x³ - 125