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andrew-mc [135]
3 years ago
5

Log subscript-4 (m^2)=log subscript-4 (18-7m)?

Mathematics
2 answers:
frez [133]3 years ago
3 0

Answer:

  • m = {-9, 2}

Step-by-step explanation:

  • log₄ (m²) = log₄ (18 - 7m)

18 - 7m > 0 ⇒ 7m < 18 ⇒ m < 18/7

  • m² = 18 - 7m
  • m² + 7m - 18 = 0
  • m² + 2*3.5m + 12.25 = 30.25
  • (m + 3.5)² = 5.5²
  • m = - 3.5 ± 5.5
  • m = 2
  • m = -9
Yanka [14]3 years ago
3 0

Answer:

\displaystyle m_{1} =   2     \quad \text{and} \quad  \displaystyle m  _{2}  =  - 9

Step-by-step explanation:

we are given a logarithm equation

\displaystyle   \log_{4}( {m}^{2} )  =   \log_{4}(18 - 7m)

notice that, we have \log_4 both sides therefore we can get rid of it

\displaystyle {m}^{2}  = 18 - 7m

in order to solve it we should make it standard form we know that

\displaystyle a {x}^{2}  + bx + c = 0

so right hand side expression to left hand side and change its sign:

\displaystyle {m}^{2}    + 7m- 18=0

now we can solve it by using factoring method

to do so rewrite the middle term as sum or subtraction of two different terms

in that case -2m+9m is good to use

\displaystyle  {m}^{2}  - 2m + 9m - 18 = 0

factor out m:

\displaystyle  m({m}^{}  - 2 )+ 9m - 18 = 0

factor out 9:

\displaystyle  m({m}^{}  - 2 )+ 9(m - 2)= 0

group:

\displaystyle (m - 2)(m + 9) = 0

hence,

\displaystyle m_{1} =   2     \quad \text{and} \quad  \displaystyle m  _{2}  =  - 9

remember that,

when we deal with logarithm equation we should always check the roots

let's check the root 1:

\displaystyle   \log_{4}( {2}^{2} ) \stackrel{?}{=}   \log_{4}(18 - 7.2)

simplify square:

\displaystyle   \log_{4}( 4) \stackrel{?}{=}   \log_{4}(18 - 7.2)

simplify multiplication:

\displaystyle   \log_{4}( 4) \stackrel{?}{=}   \log_{4}(18 - 14)

simplify substraction:

\displaystyle   \log_{4}( 4) \stackrel{?}{=}   \log_{4}(4)

simplify logarithm:

\displaystyle   1 \stackrel{ \checkmark}{=}   1

let's check root 2:

\displaystyle   \rm \log_{4}( { - 9}^{2} ) \stackrel{?}{=}   \log_{4}(18 -  7.( - 9))

simplify square:

\displaystyle   \rm \log_{4}( 81 ) \stackrel{?}{=}   \log_{4}(18  + 63)

simplify addition:

\displaystyle   \rm \log_{4}( 81 ) \stackrel{ \checkmark}{=}   \log_{4}(81)

therefore,

\displaystyle m_{1} =   2     \quad \text{and} \quad  \displaystyle m  _{2}  =  - 9

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