Find the following products: (4 a+5 b) (5 a-6 b) - Vidyadip

Question

Find the following products:
$(4 a+5 b) \times(5 a-6 b)$

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Answer

$(4 a+5 b) \times(5 a-6 b)$
$=20 a^2-24 a b+25 a b-30 b^2$
$=20 a^2+a b-30 b^2$

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