jawab lat 6 yg di lingkarin sma lat 7 yg di lingkarin sma yg no. 5

latihan 6
3)
( a + 3 ) (2a + 3)
= 2a^2 + 3a + 6a + 9
= 2a^a + 9a + 9

4)
(4m + 1) (2m + 3 )
= 8m^2 + 12m + 2m + 3
= 8m^2 + 14m + 3

latihan 7
c)
(3m^2 - 5n)( 3m^2 + 5n)
= 9m^4 + 15m^2n - 15m^2n - 25n^2
= 9m^4 - 25n^2

keterangan : ^ = pangkat

5)
luas papan besar
= panjang x lebar
= (2h+h) x (h)
= 3h x h
= 3h^2

luas papan kecil  (yg putih)
=panjang x lebar
= 5 x h
= 5h

luas papan
= papan besar - papan kecil
= 3h^2 - 5h