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4^( x + 1) + 11 x 2^x -3 = 0
(2²)^(x + 1) + 11 × 2^x - 3 = 0
2^2x × 2² + 11 × 2^x - 3 = 0
4p² + 11p - 3 = 0
( 4p -1)(p + 3)
p= 1/4 (memenuhi) dan p = -3(tidak memenuhi karena nilainya minus)
p = 2^x
1/4 = 2^x
2^ -2 = 2^x
x = -2
2. 2^(2x + 2) - 18 × 2^x + 8 = 0
2^2x × 2² - 18 × 2^x + 8 = 0
4p² - 18p + 8 = 0
(4p -2)(p -4)
P1 = 2 dan P2 =4
p1 = 2^x ............p2 = 2^x
2 = 2^x.............2² = 2^x
x = 1...................x= 2
3. misalkan p = 3^x
3^(x + 1) + 9^(x + 1) - 12 =0
3^x × 3 + (3²)^(x +1) - 12 =0
3^x × 3 + 3^2x × 3² - 12 = 0
3p + 9p² - 12 =0
9p² + 3p - 12 = 0
(9p + 12)( p - 1)
p = - 12/9 (tidak memenuhi karena minus ) dan p = 1(memenuhi )
p = 3^x
1= 3^x
3^0= 3^x
x = 0
keterangan ' ^ ' dibaca pangkat.
3 pangkat nol = 1 ya