If `8^(x+1)=64 ,` what is the value of `3^(2x+1)` ? 1 (b) 3 (c) 9 (d) 27

If 8^(x+1)=64 , what is the value of 3^(2x+1) ? (a)1 (b) 3 (c) 9 (d) 27

The average of X_(1),backslash X_(2) and X_(3) is 14. Twice the sum of X_(2) and X_(3) is 30. What is the value of X_(1)?( a) 12 (b) 16(c)20 (d) 27

If 3x+(1)/(2x)=5 then what is the value of 27x^(3)+(1)/(8x^(3)) ?

If (a)/(b)=(1)/(3),backslash(b)/(c)=2,backslash(c)/(d)=(1)/(2),backslash(d)/(e)=3 and (e)/(f)=(1)/(4), then what is the value of (abc)/(def)?(1)/(4) (b) (3)/(4)(c)(3)/(8)(d)(27)/(4) (e) (27)/(8)

If (x-1)/(x)=3, then the value of 1+(1)/(x^(2)) is (a) 9(b) 10(c)11 (d) None of these

The minimum value of 2x^2 +x-1 is: a) -1/4 b) 3/2 c) -9/8 d) 9/4