15^2=9^2+х^2
225-81=х^2
Х=кор 144
Х=12
Основание= 12*2+16
Основание=40
Log(49)x=log(36*15/12)=log(49)45⇒x=45
y=45*45^(log(45)2)=45*2=90
1)log(2)x/y=log(2)(45/90)=log(2)(1/2)=-1
2)√(x+y)/15=√(45+90)/15=√(135/15)=√9=2
1) ( 2n + 3 )^2 = 4n^2 + 12n + 9
2) ( 2n - 3 )( 2n + 5 ) = 4n^2 + 10n - 6n - 15 = 4n^2 + 4n - 15
3) 4n^2 + 12n + 9 - ( 4n^2 + 4n - 15 ) = 4n^2 + 12n + 9 - 4n^2 - 4n + 15 = 8n + 24
4) 8n + 24 = 8( n + 3 )