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6² = (2x+1) x
36 = 2x²+x
2x²+x-36 =0
(2x+9)(x-4) = 0
jadi nilai x yang memenuhi x-4 = 0 jadi x = 4
panjang BD = 2x+1 = 2.4 +1 = 9 cm
BC² = 6² + (2X+1)²
BC² = 36 + 4X² + 1 + 4X = 4X² + 4X + 37
AC² = 6² + X² = X² + 36
4X² + 4X + 37 + X² + 36 = 9X² + 6X + 1
5X² + 4X + 73 = 9X² + 6X + 1
O = 4X² + 2X - 72
O = (2X+9)(X-4)
nilai x harus 4
maka BD = 2X + 1 = 8 + 1 = 9