Math, asked by abhishek44560, 9 months ago

solvethe following by completing method
x {}^{2}  - 3x - 10 = 0

Answers

Answered by sathvik7678
1

Step-by-step explanation:

 {x}^{2}  - 3x - 10 = 0

 {x}^{2}  - 2x + 5x - 10 = 0

x(x - 2) + 5(x - 2) = 0

(x + 5)(x - 2) = 0

x = 2 \: or \: x =  - 5

HOPE UT HELPS...

Answered by Mora22
0

Answer:

complete \: squaring \: method:

 {x}^{2}  - 3x - 10 = 0 \\  {x}^{2}  - 2 \times  \frac{3}{2}  \times x + ( \frac{3}{2}) {}^{2}  = 10 + ( \frac{3}{2}) {}^{2}

 {(x -  \frac{3}{2} })^{2} = 10 +  \frac{9}{4}

(x -  \frac{3}{2} ) =  + or -  \frac{7}{2}

x =  \frac{7}{2} +   \frac{3}{2} or \: x =  -  \frac{7}{2}  +  \frac{3}{2}

so \: x = 5 \: or \:  - 2

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