16(5x+4)^2 - 9(3x-2)^2
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=16[(5x)^2+(4)^2+2(5x)(4)]-9[(3x)^2+(2)^2-2(3x)(2)]
=16(25x^2+16+140x)-9(9x^2+4-12x)
=400x^2+256+2240x-81x^2-36+108x
=319x^2+2348x+220
=16(25x^2+16+140x)-9(9x^2+4-12x)
=400x^2+256+2240x-81x^2-36+108x
=319x^2+2348x+220
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