Tolong bantu pr matematika kak plis buat besok​

Persamaan Kuadrat

No. 1

2x (x + 7) = 0

2x = 0

x = 0

x + 7 = 0

x = -7

x = {-7 , 0}

No. 2

(x + 2)(x + 15) = 0

x + 2 = 0

x = -2

x + 15 = 0

x = -15

x = {-15 , -2}

No. 3

(5 – 2x)(4 + x) = 0

5 – 2x = 0

2x = 5

x = 5/2

4 + x = 0

x = -4

x = {-4 , 5/2}