Simplify: (2x - 4y + 7)(2x + 4y + 7) - Mathematics

Simplify:
(2x - 4y + 7)(2x + 4y + 7)

Sum

(2x - 4y + 7)(2x + 4y + 7)
= (2x + 7 - 4y)(2x + 7 + 4y)
= (2x + 7)² - (4y)²
= 4x²+ 2(2x)(7) + 7² - 16y²
= 4x² - 16y² + 28x + 49.

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Chapter 4: Expansions - Exercise 4.2

Chapter 4 Expansions
Exercise 4.2 | Q 24.13

If \[x^2 + \frac{1}{x^2} = 98\] ,find the value of \[x^3 + \frac{1}{x^3}\]

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(95)²

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103³

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