Question

a)12.(x-5)+7(3-x)=5 b)2.x²-3=29

Answer 1

a) \(12x-60+21-7x-5=0\)

\(\Rightarrow5x-44=0\)

\(\Rightarrow5x=44\)

\(\Rightarrow x=\frac{44}{5}\)

Vậy: \(x=\frac{44}{5}\)

Answer 2

b) \(2x^2-3=29\)

\(\Rightarrow2x^2=3+29=32\)

\(\Rightarrow x^2=\frac{32}{2}=16\)

\(\Rightarrow x=\sqrt{16}=4\)

Vậy: \(x=4\)