Penjelasan dengan langkah-langkah:
12. 3(x - 3) + 4(x + 2) = 3x - 9 + 4x + 8
= 7x - 1
13. panjang ( x + 4 ), subs x = 8. ( 8 + 4 ) = 12
lebar ( x - 3 ), subs x = 8. ( 8 - 3 ) = 5
Luas = panjang × lebar
= 12 × 5 = 60 m²
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Penjelasan dengan langkah-langkah:
12. 3(x - 3) + 4(x + 2) = 3x - 9 + 4x + 8
= 7x - 1
13. panjang ( x + 4 ), subs x = 8. ( 8 + 4 ) = 12
lebar ( x - 3 ), subs x = 8. ( 8 - 3 ) = 5
Luas = panjang × lebar
= 12 × 5 = 60 m²