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ziro4ka [17]
4 years ago
6

Use a truth table to show that P Qand (~PV Q) A (~QV P) are equivalen

Mathematics
1 answer:
kati45 [8]4 years ago
8 0

Answer:  The given logical equivalence is proved below.

Step-by-step explanation:  We are given to use truth tables to show the following logical equivalence :

P ⇔ Q ≡ (∼P ∨ Q)∧(∼Q ∨ P)

We know that

two compound propositions are said to be logically equivalent if they have same corresponding truth values in the truth table.

The truth table is as follows :

P     Q      ∼P     ∼Q     P⇔ Q    ∼P ∨ Q     ∼Q ∨ P        (∼P ∨ Q)∧(∼Q ∨ P)

T     T         F        F             T            T                   T                       T

T     F         F        T             F             F                   T                       F

F     T         T        F             F            T                   F                       F

F     F         T        T             T            T                   T                       T

Since the corresponding truth vales for P ⇔ Q and (∼P ∨ Q)∧(∼Q ∨ P) are same, so the given propositions are logically equivalent.

Thus, P ⇔ Q ≡ (∼P ∨ Q)∧(∼Q ∨ P).

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3 years ago
1/4b^2+ 4bc + 16c?<br> Answer?
Charra [1.4K]

Answer:

1/4b^2+ 4bc + 16c?=4

Step-by-step explanation:

STEP

1

:

           1

Simplify   —

           4

Equation at the end of step

1

:

   1                  

 ((— • b2) +  4bc) +  16c

   4                  

STEP

2

:

Equation at the end of step 2

  b2            

 (—— +  4bc) +  16c

  4            

STEP

3

:

Rewriting the whole as an Equivalent Fraction

3.1   Adding a whole to a fraction

Rewrite the whole as a fraction using  4  as the denominator :

          4bc     4bc • 4

   4bc =  ———  =  ———————

           1         4  

Equivalent fraction : The fraction thus generated looks different but has the same value as the whole

Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator

Adding fractions that have a common denominator :

3.2       Adding up the two equivalent fractions

Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

b2 + 4bc • 4     b2 + 16bc

————————————  =  —————————

     4               4    

Equation at the end of step

3

:

 (b2 + 16bc)    

 ——————————— +  16c

      4        

STEP

4

:

Rewriting the whole as an Equivalent Fraction

4.1   Adding a whole to a fraction

Rewrite the whole as a fraction using  4  as the denominator :

          16c     16c • 4

   16c =  ———  =  ———————

           1         4  

STEP

5

:

Pulling out like terms

5.1     Pull out like factors :

  b2 + 16bc  =   b • (b + 16c)

Adding fractions that have a common denominator :

5.2       Adding up the two equivalent fractions

b • (b+16c) + 16c • 4     b2 + 16bc + 64c

—————————————————————  =  ———————————————

          4                      4      

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