Question

3*x²=48

giúp mik với.

Answer 1

\(3.x^2=48\)

\(x^2=48:3\)

\(x^2=16\)

\(x^2=4^2\)

\(\Rightarrow x=4\)

Answer 2

3.x²=48

=>x²=48:3

=>x²=16

=>x²=4²

=> x=2

Answer 3

\(3.x^2=48\)

\(x^2=48:3=16\)

\(x^2=16=4^2\)

\(^{=>x=4}\)

Nhớ đúng cho mk nha bn ^^

Answer 4

\(3\cdot x^2=48\)

\(\Leftrightarrow x^2=48:3\)

\(\Leftrightarrow x^2=12\)

\(\Leftrightarrow x^2=\left(\pm\sqrt{12}\right)^2\Leftrightarrow x=\pm\sqrt{12}\)

Answer 5

nhầm x=4

Answer 6

\(3.x^2=48\)

\(x^2=48:3\)

\(x^2=16\)

\(x^2=4^2\)

\(\Rightarrow x=4\)

Answer 7

\(3\cdot x^2=48\)

\(x^2=48:3\)

\(x^2=16\)

mà 4² = 16 và ( - 4 )² = 16

=> \(x\in\left\{4;-4\right\}\)

Vậy...

Cbht

Answer 8

\(3x^2=48\)

\(\Leftrightarrow x^2=48:3\)

\(\Leftrightarrow x^2=16\)

\(\Leftrightarrow x^2=4^2=\left(-4\right)^2\)

\(\Leftrightarrow\orbr{\begin{cases}x=4\\x=-4\end{cases}}\)

Answer 9

  \(3.x^2=48\)      

      \(x^2=48:3\)

      \(x^2=16\)

\(\Rightarrow x^2=4^2\)hoặc \(x^2=\left(-4\right)^2\)

\(\Rightarrow x=4\)hoặc \(x=-4\)

Vậy \(x\in\left\{4;-4\right\}\)

Answer 10

Mk nhầm!

\(3\times x^2=48\)

\(\Leftrightarrow x^2=48:3\)

\(\Leftrightarrow x^2=16\)

\(\Leftrightarrow x^2=\left(\pm4\right)^2\Leftrightarrow x=\pm4\)

Answer 11

3.x²=48

x²=48:3

x²=16

\(\Rightarrow\) x² =4²=(-4)²

\(\Rightarrow\)TH1:x=4      TH2:x=-4

Vậy x =4 hoặc x=-4