Question

find the value of r =2r²+7r+15/r²-3r+9
S=3 r =6​

Answer 1

Answer: The question is not correct. I have explained this in the answer post underneath.

Step-by-step explanation: Take r = 6 (as stated)

Then, replace all the 'r' with the number 6

So,

6 = 2(6)² + 7(6) + 15/(6)² - 3(6) + 9

6 = 2(36) + 42 + (15/36) - 18 + 9   (According to BODMAS AND PEMDAS)

6 = 2(36) + 42 + (5/12) - 18 + 9

6 = 72 + 42 + (5/12) - 18 + 9

6 = 114 + (5/12) - 18 + 9

6 = 114 + (5/12) -9

6 = 105 + (5/12)

6 = 1265/12

72 = 1265 (when you multiply 12 on both sides to keep the equation balanced)

Now, since 72 ≠ 1265, therefore this equation is unbalanced and hence the question is not correct.

Hope it helps..