If a/b = 3/7 which of the following is equal to (2a+4b)/(2a-4b)? the answer is -17/11 but im trying to figure out how

If a/b = 3/7 which of the following is equal to (2a+4b)/(2a-4b)?

The answer is -17/11 but im trying to figure out how

Step-by-step explanation:

a / b = 3/7; (2a + 4b) / (2a-4b)

Replace the values of a and b:

(2x3) + (4x7) / (2x3) - (4x7)

6 + 28/6 - 28

34 / - 22

We simplify dividing each term by 2 and we have left: - 17/11

this answer is !

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.