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= 2 x ( (3X- 4) +(X + 1) )
= 2 x (4X-3)
= 8X - 6
b. 34 = 8X -6
X = 5
luas persegi panjang tersebut= p x l
= (3. 5 - 4) (5+1)
= 11 . 6
= 66 cm²
= 2 × ( (3x- 4) +(x + 1) )
= 2 × (4x-3)
= 8x - 6
b. 34 = 8x -6
34+6=8x
40=8x
5=x
luas persegi panjang tersebut= p × l
= ((3x-4) × (x+1)) cm²
= ((3. 5 - 4) (5+1)) cm²
= (11 × 6) cm²
= 66 cm²