9(a - 2)^2 - 16(a + 2)^2
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9(a -2)^2-16(a+2)^2
=9(a^2-4)-16(a^2+4)
=9a^2-36-16a^2+64
=-7a^2+28
if it wrong, I really sorry
gaya57:
if it is wrong I am really sorry .
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