Verify the Fraction Equation: Is (a+c)/(b+a) = c/b True?

Fraction Equations with Algebraic Terms

Indicate whether the following expression is true or false:

a+cb+a=cb \frac{a+c}{b+a}=\frac{c}{b}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Determine if the equation is correct
00:07 Comparing the expressions as they are, we can see they are not equal
00:12 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Indicate whether the following expression is true or false:

a+cb+a=cb \frac{a+c}{b+a}=\frac{c}{b}

2

Step-by-step solution

Begin by examining the problem:

a+cb+a=?cb \frac{a+c}{b+a}\stackrel{?}{= }\frac{c}{b}

Note that the expression on the left side cannot be simplified, despite the fact that both in the numerator and denominator there is the term a a . This is due to the fact that it is connected to the other term (both in numerator and denominator) and does not multiply it, therefore simplification - which is essentially applying the division operation which is the inverse operation of multiplication, is not possible, and therefore the current form of the expression on the left side:

a+cb+a \frac{a+c}{b+a}

is its final and most simplified form,

The term on the right side is:

bc \frac{b}{c}

Therefore the expressions on both sides of the (assumed) equality are not equivalent, meaning:

a+cb+a!cb \frac{a+c}{b+a}\stackrel{!}{\neq }\frac{c}{b}

(In other words, there is no identical equality- that holds true for all possible values of the parameters a,b,c a,b,c )

Therefore, the correct answer is answer B.

3

Final Answer

Not true

Key Points to Remember

Essential concepts to master this topic
  • Rule: Fractions with addition cannot be simplified by canceling terms
  • Technique: Cross-multiply to check: (a+c)×b should equal c×(b+a)
  • Check: Test with specific values like a=2, b=3, c=1 to verify inequality ✓

Common Mistakes

Avoid these frequent errors
  • Incorrectly canceling the 'a' terms
    Don't cancel 'a' from numerator and denominator in a+cb+a \frac{a+c}{b+a} = wrong simplification! Addition connects terms differently than multiplication. Always remember that only common factors can be canceled, not added terms.

Practice Quiz

Test your knowledge with interactive questions

Determine if the simplification shown below is correct:

\( \frac{7}{7\cdot8}=8 \)

FAQ

Everything you need to know about this question

Why can't I cancel the 'a' from top and bottom?

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You can only cancel factors (terms that multiply), not terms that are added. In a+cb+a \frac{a+c}{b+a} , the 'a' is added to other terms, not multiplying the whole expression.

How do I know if two fractions are equal?

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Cross-multiply! If a+cb+a=cb \frac{a+c}{b+a} = \frac{c}{b} , then (a+c) × b should equal c × (b+a). Expand both sides and compare.

Can I test this with actual numbers?

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Absolutely! Try a=1, b=2, c=3: Left side = 1+32+1=43 \frac{1+3}{2+1} = \frac{4}{3} , Right side = 32 \frac{3}{2} . Since 4332 \frac{4}{3} ≠ \frac{3}{2} , they're not equal!

What's the difference between adding and multiplying in fractions?

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With multiplication like acba \frac{a \cdot c}{b \cdot a} , you can cancel the 'a'. With addition like a+cb+a \frac{a + c}{b + a} , you cannot cancel because addition doesn't create common factors.

Is there ever a case where these fractions would be equal?

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Only for specific values, not for all values of a, b, and c. The question asks if it's always true (an identity), which it's not.

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