Aurel F

18 September 2023 22:21

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Aurel F

18 September 2023 22:21

Pertanyaan

berapa hasil akar2 berikut menggunakan bentuk kuadrat sempurna! (no ngasal) 1. x²+x-2=0 2. 2x²+2x-3=0

berapa hasil akar2 berikut menggunakan bentuk kuadrat sempurna! (no ngasal)

1. x²+x-2=0

2. 2x²+2x-3=0

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Sumber W

Community

19 September 2023 00:36

Jawaban terverifikasi

<p>Penyelesaian Persamaan Kuadrat dengan Melengkapkan bentuk Kuadrat Sempurna</p><p>1. x² + x - 2 = 0</p><p>&nbsp; &nbsp; x² + x = 2</p><p>&nbsp; &nbsp; x² + x &nbsp;+ (1/2)<sup>2</sup> = 2 + (1/2)<sup>2</sup></p><p>&nbsp; &nbsp; (x + 1/2)<sup>2</sup> = 2 + 1/4</p><p>&nbsp; &nbsp; (x + 1/2)<sup>2</sup> = 8/4 + 1/4</p><p>&nbsp; &nbsp; (x + 1/2)<sup>2</sup> = 9/4</p><p>&nbsp; &nbsp; x + 1/2 = ± √(9/4)</p><p>&nbsp; &nbsp; x = -1/2 ± 3/2</p><p>&nbsp; &nbsp; x<sub>1</sub> = &nbsp;-1/2 + 3/2 = 2/2 = 1</p><p>&nbsp; &nbsp; x<sub>2</sub> = &nbsp;-1/2 - 3/2 = -4/2 = -2</p><p>&nbsp;</p><p>2. 2x² + 2x - 3 = 0</p><p>&nbsp; &nbsp; &nbsp;x² + x - 3/2 = 0 &nbsp;(dibagi 2 supaya koefisien x<sup>2</sup> sama dengan 1)</p><p>&nbsp; &nbsp; &nbsp;x² + x = 3/2&nbsp;</p><p>&nbsp; &nbsp; &nbsp;x² + x &nbsp;+ (1/2)<sup>2</sup> = 3/2 + (1/2)<sup>2</sup></p><p>&nbsp; &nbsp; (x + 1/2)<sup>2</sup> = 3/2 + 1/4</p><p>&nbsp; &nbsp; (x + 1/2)<sup>2</sup> = 6/4 + 1/4</p><p>&nbsp; &nbsp; (x + 1/2)<sup>2</sup> = 7/4</p><p>&nbsp; &nbsp; x + 1/2 = ± √(7/4)</p><p>&nbsp; &nbsp; x = -1/2 ± (√7)/2</p><p>&nbsp; &nbsp; x<sub>1</sub> = &nbsp;-1/2 + (√7)/2 = (-1 + √7)/2</p><p>&nbsp; &nbsp; x<sub>2</sub> = -1/2 - (√7)/2 = (-1 - √7)/2</p>

Penyelesaian Persamaan Kuadrat dengan Melengkapkan bentuk Kuadrat Sempurna

1. x² + x - 2 = 0

    x² + x = 2

    x² + x  + (1/2)2 = 2 + (1/2)2

    (x + 1/2)2 = 2 + 1/4

    (x + 1/2)2 = 8/4 + 1/4

    (x + 1/2)2 = 9/4

    x + 1/2 = ± √(9/4)

    x = -1/2 ± 3/2

    x1 =  -1/2 + 3/2 = 2/2 = 1

    x2 =  -1/2 - 3/2 = -4/2 = -2

 

2. 2x² + 2x - 3 = 0

     x² + x - 3/2 = 0  (dibagi 2 supaya koefisien x2 sama dengan 1)

     x² + x = 3/2 

     x² + x  + (1/2)2 = 3/2 + (1/2)2

    (x + 1/2)2 = 3/2 + 1/4

    (x + 1/2)2 = 6/4 + 1/4

    (x + 1/2)2 = 7/4

    x + 1/2 = ± √(7/4)

    x = -1/2 ± (√7)/2

    x1 =  -1/2 + (√7)/2 = (-1 + √7)/2

    x2 = -1/2 - (√7)/2 = (-1 - √7)/2


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ADAM M

25 Juni 2024 00:34

<p>1. x² + x - 2 = 0</p><p>x² + 2x - x - 2 = 0</p><p>x(x + 2) - (x+2) = 0</p><p>(x+2)×(x-1) = 0</p><p>x + 2 = 0</p><p>x = -2</p><p>x -1 = 0</p><p>x = 1</p>

1. x² + x - 2 = 0

x² + 2x - x - 2 = 0

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

(x+2)×(x-1) = 0

x + 2 = 0

x = -2

x -1 = 0

x = 1


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