( a+4)^2 - ( a-5)^2 ?
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a^2+4^2+8a-(a^2+5^2-10a) a^2+16+8a-a^2-25+10a -9=-18a a-1/2 Hope this is ur answer frnd
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=(a+4)²-(a-5)²
=(a+4+a-5)(a+4-a+5)
=(2a-1)9
=18a-9
=(a+4+a-5)(a+4-a+5)
=(2a-1)9
=18a-9
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