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Mathematics

Evaluate:

(3x - 4y) (3x + 4y) (9x2 + 16y2)

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Answer

(3x - 4y) (3x + 4y) (9x2 + 16y2)

Using the formula

[∵ (x + y)(x - y) = x2 - y2]

= [(3x)2 - (4y)2] (9x2 + 16y2)

= (9x2 - 16y2) (9x2 + 16y2)

= (9x2)2 - (16y2)2

= 81x4 - 256y4

Hence, (3x - 4y) (3x + 4y) (9x2 + 16y2) = 81x4 - 256y4

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