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BISSMILAHIROHMANIRIHIM
Nama
: Abdul Latif M
No Absen
:1
Kelas
: X MIPA 7
Latihan
1| 43x+1≥(1/8)2x-5 2| (∛)2x2 ≤ (1/27)x-18 3|
5x2-7x+12 ≥ 72x2-7x+12
Jawaban
1. 43x+ > (1/8)2x-5 = 43x+1 > (1/3)2x-5 = 43x+1 > (2-3)2x-5 = 43+1 > 2-6x+15 = (22)3x+1 > 2-6x+15 = 26x+2 > -6x+15 = 6x+2 ≥ -6x+15 = 6x+6x > 15-2 12x > 13/2 2. (∛) 2x2 < (1/27)x-18 (31-2)2x2 < (1/33) x-18 = 3x2 < (3-3) x-18 = 3x2 < 3-3x+54 =x2 – 3x -54=0 (x 6)(x + 9)=0 x-6=0 x + 9=0 x=6 x=9 3. 51x2-7x=12 ≥ 72x2-7x+12 X2-7x+12 ≥ 0 X2-7x12=0 (x – 3) (x – 4) X – 3=0 x – 4=0 X= -3 x=4
Nama
: Abdul Latif M
No Absen
:1
Kelas
: X MIPA 7
Latihan
1| 43x+1≥(1/8)2x-5 2| (∛)2x2 ≤ (1/27)x-18 3|
5x2-7x+12 ≥ 72x2-7x+12
Jawaban
1. 43x+ > (1/8)2x-5 = 43x+1 > (1/3)2x-5 = 43x+1 > (2-3)2x-5 = 43+1 > 2-6x+15 = (22)3x+1 > 2-6x+15 = 26x+2 > -6x+15 = 6x+2 ≥ -6x+15 = 6x+6x > 15-2 12x > 13/2 2. (∛) 2x2 < (1/27)x-18 (31-2)2x2 < (1/33) x-18 = 3x2 < (3-3) x-18 = 3x2 < 3-3x+54 =x2 – 3x -54=0 (x 6)(x + 9)=0 x-6=0 x + 9=0 x=6 x=9 3. 51x2-7x=12 ≥ 72x2-7x+12 X2-7x+12 ≥ 0 X2-7x12=0 (x – 3) (x – 4) X – 3=0 x – 4=0 X= -3 x=4
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