Question

o valor de 2x^0+x^3/4+18x^-0,5. quando x =81 é

a)30
b)31
c)35
d)36
e)38​

Answer 1

$2x {}^{0} + x {}^{ \frac{3}{4} } + 18x {}^{ - 0.5} \\ \\ x = 81 \\ \\ \\ \\ 2 \times 81 {}^{0} + 81 {}^{ \frac{3}{4} } + 18 \times 81 {}^{ - 0.5} \\ \\ 2 \times 1 + \sqrt[4]{81 {}^{3} } + 18 \times ( \frac{1}{81} ) {}^{ \frac{1}{2} } \\ \\ 2 + 27 + 18 \times \sqrt{ \frac{1}{81} } \\ \\ 2 + 27 + 18 \times \frac{1}{9} \\ \\ 2 + 27 + \frac{18}{9} \\ \\ 2 + 27 + 2 \\ \\ 31$

B) 31