Express irrational solutions in exact form and as a decimal rounded to three decimal places. \log_{2}(3x+2)-\log_{4}x=3

fortdefruitI

fortdefruitI

Answered question

2021-06-06

Irrational solutions should be expressed precisely and as a decimal rounded to three places.
log2(3x+2)log4x=3

Answer & Explanation

ottcomn

ottcomn

Skilled2021-06-07Added 97 answers

Step 1
Given,
log2(3x+2)=log4x=3
Step 2
Now,
log2(3x+2)log4x=3
log2(3x+2)log22x=3
log2(3x+2)12log2x=3 ( logabc=1blogac)
log2(3x+2)log2(x1/2)=3 ( alogbc=logbca)
log2(3x+2x1/2)=3 ( logbalogbc=logb(ac))
3x+2x=23 (logba=c a=bc)
3x+2x=8
(3x+2)=8x
Squaring both sides,
(3x+2)2=8x
9x2+4+15x=64x
9x252x+4=0
x=(52)± (52)24× 9× 42× 9
x=52±270414418
x=52±256018
x=52±161018
x=4(13±410)18
x=2(13±410)18
x=2(13+4109, 2(13410)9
are the solutions to the given problem in irrational form.
In decimals, we get, x=5.69980, 0.07797
Thus, after converting the irrationals to decimals and rounding them off to nearest three decimal places, we get, 5.700, 0.0780

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