Question

15 a2 − 1 = 5 2a − 2 Which equation results from cross-multiplying?

Answer 1

Given the expression:
15/(a²-1)=5/(2a-2)
cross-multiplying the above we get:
15×(2a-2)=5×(a²-1)
this will give us:
15(2a-2)=5(a²-1)

Answer: b]15(2a – 2) = 5(a2 – 1)

Answer 2

Answer:

Option (b) is correct.

${15}(2a-2)={5}(a^2-1)$ equation results from cross-multiplying.

Step-by-step explanation:

 Given : expression $\frac{15}{a^2-1}=\frac{5}{2a-2}$

We have to find the results obtained from cross-multiplying the given expression and choose the correct option from given options.

Consider the given expression $\frac{15}{a^2-1}=\frac{5}{2a-2}$

Cross multiply  is done by Multiplying the top and bottom of the first fraction by the bottom number of the second fraction.

Thus, for the given expression $\frac{15}{a^2-1}=\frac{5}{2a-2}$

We have,

${15}(2a-2)={5}(a^2-1)$

Thus, option (b) is correct.