18.8k views
17 votes
X^2+10x-39=0
find x

Please Please Please Please Please Please Need Help Now

2 Answers

9 votes

We are given with the equation x² + 10x - 39 = 0 and need to find x, so let's start ;


{:\implies \quad \sf x^(2)+10x-39=0}

By using splitting the middle term method, Rewrite as ;


{:\implies \quad \sf x^(2)+13x-3x-39=0}


{:\implies \quad \sf x(x+13)-3(x+13)=0}


{:\implies \quad \sf (x+13)(x-3)=0}

So, here either (x + 13) = 0 or (x - 3) = 0, when you equate both of them with 0, you will get x = -13 and x = 3

Hence, The required answer is -13 and 3

User Ilyssa
by
8.5k points
11 votes

Answer :

  • x = 3 or x = -13

Explanation :


\longrightarrow \sf \qquad {x}^(2) + 10x - 39 = 0

We have to find the two numbers a and b such that,


\longrightarrow \sf \qquad a + b = 10


\longrightarrow \sf \qquad a b = 39

Obviously, the two numbers are 3 and 13.


\longrightarrow \sf \qquad {x}^(2) - 3x + 13x - 39 = 0


\longrightarrow \sf \qquad {x}(x - 3)+ 13(x - 3) = 0


\longrightarrow \sf \qquad ({x}+ 13)(x - 3) = 0

Whether, the value of x :


\longrightarrow \sf \qquad {x}+ 13 = 0


\longrightarrow \pmb{\bf \qquad {x} = - 13}

Whether, the value of x :


\longrightarrow \sf \qquad {x} - 3 = 0


{\longrightarrow { \pmb{\bf \qquad {x} = 3}}}

User Benpage
by
8.5k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories