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Expand: (2a + 3b)(2a - 3b). -

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Question

Expand: (2a + 3b)(2a - 3b).

Sum

Solution

(2a + 3b)(2a - 3b)

= (2a)2 + [(3b) + (- 3b)]2a + [3b × (-3b)]

= 4a2 + 0  × 2a - 9b2

= 4a2 - 9b2

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Expansion of (x + a)(x + b)
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