If x=8+37andxy=1, then 1x2+1y2 is:
254
192
292
66
62
Explanation for the correct option.
Step 1: Find the value of 1x.
x=8+37⇒1x=18+37=18+37×8-378-37=8-3782-(37)2=8-3764-63=8-37
Step 2: Find the value of 1y.
xy=1⇒x=1y⇒1y=8+37
Step 3: Find the value of 1x2+1y2.
1x2+1y2=1x2+x2=8-372+8+372=64-487+63+64+487+63=254
Hence, option A is correct.
If f=x1+x2+13(x1+x2)3+15(x1+x2)5+... to ∞ and g=x−23x3+15x5+17x7−29x9+..., then f=d×g. Find 4d.
Determine whether the following numbers are in proportion or not:
13,14,16,17