Math, asked by vilot, 1 year ago

Solve this equation using an algebraic method: (x + 4)( x - 4) = 9


Answers

Answered by amisharaj
3
(x+4(x-4)=9
2x=9
x=9/2
x=4.5

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Answered by BrainlyVirat
7
Answer : 5

Step by step explanation :

Given equation : ( x + 4 ) ( x - 4 ) = 9

Using the identity,

\tt{(a +b)(a - b) = a{}^{2}-b{}^{2}}

We get,

\tt{( x + 4 )( x - 4 ) = 9 }

\tt{x{}^{2}-4{}^{2}= 9} \\ \\\tt{x{}^{2}-16=9}

\tt{x{}^{2}=9+16}

\tt{x{}^{2}=25}

\tt{x =5}

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