Diketahui persegi panjang PQRS dengan PQ= 8 cm, QR = (4x – 2) cm, dan luasnya 48 cm² . tentukan nilai x!

diketahui persegi panjang PQRS dengan PQ= 8 cm, QR = (4x – 2) cm, dan luasnya 48 cm² . tentukan nilai x!

Jawaban yang benar adalah x = 2.

Ingat kembali :
• Luas persegi panjang = panjang×lebar

• Perkalian suku aljabar suku satu dengan suku dua
Pengurangan: a × (b – c) = ab – ac

Pembahasan :
Luas = panjang×lebar
Luas = PQ × QR
48 = 8(4x-2)
48 = 8(4x)-8(2)
48 = 32x -16
48+16 = 32x-16+16
64 = 32x —> kedua ruas dikali 1/32
2 = x

Jadi, nilai x adalah 2.

Rekomendasi lainnya :

Baca Juga :  Every mornIng I 1.____ at five o'clock. First. I go to the 2.____. I 3.____ my teeth and take a bath. After that, I get 4.____ and comb my hair. Then I go to the 5.____. I eat sandwich and a glass of milk for breakfast. Then, I go to 6.____ by my 7.____. I 8.____ at school and then I study. I go 9.____ at one o'clock. I have 10.____ and play with my friends. In The evening, I 11.____ dinner with my family and then we 12.____ watching TV. I do my 13.____. I go to 14.____ at half past nine.
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