Jawaban:
Keliling = (10x - 8) cm
Luas = (6x² - 13x - 5) cm²
Penjelasan dengan langkah-langkah:
Panjang (p) = 2x - 5
Lebar (l) = 3x + 1
Keliling persegi panjang
K = 2p + 2l
= 2(2x - 5) + 2(3x + 1)
= 4x - 10 + 6x + 2
= 4x + 6x - 10 + 2
= 10x - 8
Luas persegi panjang
L = p × l
= (2x - 5) (3x + 1)
= 2x (3x + 1) - 5 (3x + 1)
= 6x² + 2x - 15x - 5
= 6x² - 13x - 5
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Jawaban:
Keliling = (10x - 8) cm
Luas = (6x² - 13x - 5) cm²
Penjelasan dengan langkah-langkah:
Panjang (p) = 2x - 5
Lebar (l) = 3x + 1
Keliling persegi panjang
K = 2p + 2l
= 2(2x - 5) + 2(3x + 1)
= 4x - 10 + 6x + 2
= 4x + 6x - 10 + 2
= 10x - 8
Luas persegi panjang
L = p × l
= (2x - 5) (3x + 1)
= 2x (3x + 1) - 5 (3x + 1)
= 6x² + 2x - 15x - 5
= 6x² - 13x - 5