expand (5ab-3) (5ab+2)
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(5ab-3)(5ab+2)
=5ab(5ab+2)-3(5ab+2)
=25a^2.b^2 +10ab - 15ab - 6
= 25a^2.b^2-5ab - 6
=5ab(5ab+2)-3(5ab+2)
=25a^2.b^2 +10ab - 15ab - 6
= 25a^2.b^2-5ab - 6
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