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Sunny_sXe [5.5K]
3 years ago
8

X puᴉɟ oʇ ǝʌɐɥ noʎ

%20%20%3D%20%20%7B4%7D%5E%7B2%7D%20" id="TexFormula1" title=" \frac{x {}^{2} }{5 {}^{2} } = {4}^{2} " alt=" \frac{x {}^{2} }{5 {}^{2} } = {4}^{2} " align="absmiddle" class="latex-formula">
​
Mathematics
1 answer:
Law Incorporation [45]3 years ago
4 0

Hello there! The value of x is 20 or -20

"20 or - 20" is one answer so you are supposed to answer 20 or -20, not choose only one.

Step-by-step explanation:

\large{ \frac{ {x}^{2} }{ {5}^{2} }  =  {4}^{2} }

First, we simplify 5² and 4²

\large{ \frac{ {x}^{2} }{25}  = 16}

Multiply the whole equation by 25 to get rid of the denominator.

\large{ \frac{ {x}^{2} }{25} (25) = 16(25)} \\  \large{ {x}^{2}  = 400}

Square both sides and solve the equation.

\large{ \sqrt{ {x}^{2} }  =  \pm{ \sqrt{400} }}

Also don't forget to write "plus or minus" symbol when we are solving a quadratic equation by squaring both sides.

\large{x = \pm{20}}

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