Question

Suppose you had bought a book from a bookstore. By mistake you left it there
instead of bringing it back with you. Providing details of the book and its author,
write a letter within 100 words to the owner of the store to find the book and
keep it until you come to

collect it.​

Answer 1

Explanation:

(2x² + 3)⁴

Write the power 4 as 2 + 2

= (2x² + 3)^2+2

Using a^m+n = a^m + a^n to expand the expression,

(2x + 3)² + (2x² + 3)²

Using (a + b)² = a² + 2ab + b² to expand the expression,

(4x⁴ + 12x² + 9) × (4x⁴ + 12x² + 9)

Multiplying the expressions

= 16x⁸ + 48x⁶ + 36x⁴ + 48x⁶ + 144x⁴ + 108x² + 38x⁴ + 108x² + 81

Collect the like terms,

= 16x⁸ + 96x⁶ + 216x⁴ + 216x² + 81