Question

10. 4(2a + b)2-(a - b)2 factorise
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Answer 1

Answer:

15a^2 + 18ab + 3b^2

Step-by-step explanation:

4(2a + b)^2 - (a - b)^2

= 4( 4a^2 + 4ab +b^2) - (a^2 - 2ab +b^2)

=16a^2 + 16ab + 4b^2 - a^2 + 2ab - b^2

=15a^2 + 18ab + 3b^2