Question

$$500=0 \times x+1/2 \times 10 \times { x }^{ 2 }$$

Answer

x=10,-10

Solution


Simplify  \(0x\)  to  \(0\).
\[500=0+\frac{1}{2}\times 10{x}^{2}\]
Use this rule: \(\frac{a}{b} \times \frac{c}{d}=\frac{ac}{bd}\).
\[500=0+\frac{1\times 10{x}^{2}}{2}\]
Simplify  \(1\times 10{x}^{2}\)  to  \(10{x}^{2}\).
\[500=0+\frac{10{x}^{2}}{2}\]
Simplify  \(\frac{10{x}^{2}}{2}\)  to  \(5{x}^{2}\).
\[500=0+5{x}^{2}\]
Simplify  \(0+5{x}^{2}\)  to  \(5{x}^{2}\).
\[500=5{x}^{2}\]
Divide both sides by \(5\).
\[\frac{500}{5}={x}^{2}\]
Simplify  \(\frac{500}{5}\)  to  \(100\).
\[100={x}^{2}\]
Take the square root of both sides.
\[\pm \sqrt{100}=x\]
Since \(10\times 10=100\), the square root of \(100\) is \(10\).
\[\pm 10=x\]
Switch sides.
\[x=\pm 10\]