Itu jga dijawab ya, gawat soalnya:v mwhehe:v

Mapel : Matematika
Kelas : VII SMP
Bab : Aljabar

Pembahasan :
1.

x² + 4x = 0
x(x + 4) = 0
x = 0
x = -4

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2.

4x² - 36x = 0
x² - 9x = 0
x(x - 9) = 0
x = 0
x = 9

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3.

x² - 81 = 0
x² - 9² = 0
(x + 9)(x - 9) = 0
x = -9
x = 9

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4.

x² = 121
x² - 121 = 0
x² - 11² = 0
(x + 11)(x - 11) = 0
x = 11
x = -11

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5.

36x² - 9 = 0
4x² - 1 = 0
(2x)² - 1² = 0
(2x + 1)(2x - 1) = 0
x = -1/2
x = 1/2

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6.

x² + 6x + 8 = 0
(x + 4)(x + 2) = 0
x = -4
x = -2

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7.

x² - 6x - 16 = 0
(x - 8)(x + 2) = 0
x = 8
x = -2

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8.

x² - 14x + 48 = 0
(x - 8)(x - 6) = 0
x = 8
x = 6

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9.

x² + 12x + 36 = 0
(x + 6)² = 0
x + 6 = 0
x = -6

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10.

x² - 14x + 49 = 0
(x - 7)² = 0
x - 7 = 0
x = 7

ralat no 2.
4x²-36x= 0
__________:4
x²-9x= 0
(x-9)(x-0)
x= 9
x= 0