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Syllabus

Expand: (5x - 4)2 -

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Question

Expand: (5x - 4)2

Sum

Solution

(5x - 4)2

= (5x)2 - 2(5x) x (4) + 42

= 25x2 - 40x + 16.

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Expansion of (a - b)2 = a2 - 2ab + b2
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