Simplify : (1.5a - 4b) (1.5a + 4b + 3) - 4.5a + 12b
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Step-by-step explanation:
(1.5a-4b)(1.5a+4b+3)-4.5a+12b
=1.5a(1.5a+4b+3)-4b(1.5a+4b+3)-4.5a+12b
=2.25a^2+6ab+4.5a-6ab-16b^2-12b-4.5a+12b
=2.25a^2-16b^2+6ab-6ab+4.5a-4.5a-12b+12b
=2.25a^2-16b^2
=(1.5a)^2-(4b)^2
=(1.5a+4b)(1.5a-4b)
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