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Syllabus

Expand: (3x + 4y)(3x - 4y) -

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Question

Expand: (3x + 4y)(3x - 4y)

Sum

Solution

(3x + 4y)(3x - 4y)

= (3x)2 - (4y)2

= 9x2 - 16y2

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Expansion of (a + b)(a - b) = a2-b2
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