Question

Answer 1

\(c,\Rightarrow-8+0,5x=1,5\\ \Rightarrow0,5x=-9,5\Rightarrow x=-19\\ d,\Rightarrow\left(-3\right)^x=\left(-3\right)^3\left(-3\right)^4=\left(-3\right)^7\\ \Rightarrow x=7\)

Answer 2

\(c,-2^3+0,5x=1,5\\ \Rightarrow-8+0,5x=1,5\\ \Rightarrow0,5x=9,5\\ \Rightarrow x=19\\ d,\dfrac{\left(-3\right)^x}{81}=-27\\ \Leftrightarrow\left(-3\right)^x=81.\left(-27\right)\\ \Leftrightarrow\left(-3\right)^x=\left(-3\right)^4.\left(-3\right)^3\\ \Leftrightarrow\left(-3\right)^x=\left(-3\right)^7\\ \Leftrightarrow x=7\)

Answer 3

c: =>1/2x-8=1,5

=>1/2x=9,5

hay x=19

d: =>(-3)^x=-3⁷

hay x=7