Question

72 Evaluate the expression for x = 3. 72 2

Answer 1

Answer:

$\boxed{\huge {\sf 7}}$

Step-by-step explanation:

$\sf Evaluate \: \frac{ {7}^{2} }{ {x}^{2} - 3 } \: where \: x = 3 : \\ \sf \implies \frac{ {7}^{2} }{ {3}^{2} - 2 } \\ \\ \sf {3}^{2} = 9 : \\ \sf \implies \frac{ {7}^{2} }{9 - 2} \\ \\ \sf 9 - 2 = 7 : \\ \sf \implies \frac{ {7}^{2} }{7} \\ \\ \sf {7}^{2} = 7 \times 7 : \\ \sf \implies \frac{7 \times \cancel{7}}{ \cancel{7}} \\ \\ \sf \implies 7$

Answer 2

Start by plugging in 3 as x. Next square the given values both on the top and bottom. It gives us 49/9-2. 49/7. ( explanation:for the top if we square 7 we get 49. For the bottom if we square 3 we get 9 and there’s also a 2 that we should subtract. We get 7 on the bottom. 49/7. Here we divide 49 by 7 and as a final result we get 7. Hope I was able to help.