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3x + 1 = x + 7
3x - x = 7 - 1
2x = 6
x = 3
maka nilai d = 3(3) + 1 = 10
luas persegi menggunakan alas: A = d²/2
A = 10²/ 2 = 100/2 = 50cm² . smga mmbntu..
=
= 3x² + 22x + 3,5 cm²
maaf kalo ada kesalahan ya :D semoga membantu
catatan : jika diagonalnya berpotongan tegak lurus, rumus luas dapat dicari dengan rumus =