Luas persegi panjang 60,panjangnya x+15 lebarnya x-2 .Tentukan panjang diagonalnya !
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(x + 15) (x -2) = 60
x²- 2x +15x - 30 = 60
x² + 13x - 90 = 0
(x + 18 ) ( x - 5) = 0
ambil yg positif
x = 5
Panjang = 5 + 15 = 20
Lebar = 5 - 2= 3
D² = 20² + 3²
= 400 + 9
D = √409 atau 20,22 cm