Kak tolong bantu kak ​

19]

4x^2 – 64 = 0

(2x + 8)(2x – 8) = 0

2x + 8 = 0 atau 2x – 8 = 0

2x = -8 atau 2x = 8

x = -8/2 atau x = 8/2

x = -4 atau x = 4

HPnya adalah {4 , -4} (A)

22]

K = 68 m

L = 240 m^2

K = 2 × (p + l)

68 = 2 × (p + l)

p + l = 68/2

p + l = 34

L = p × l

240 = p × l

p = 240/l

p + l = 34

240/l + (l^2)/l = 34

(240 + l^2)/l = 34

l^2 + 240 = 34 × l

l^2 + 240 = 34l

l^2 – 34l + 240 = 0

(l – 24)(l – 10) = 0

l – 24 = 0 atau l – 10 = 0

l = 24 atau l = 10

l = 24 tidak memenuhi karena lebih panjang dari 10 , maka l = 10 m

p = 240/l

p = 240/10

p = 24 m

d = V(p^2 + l^2)

d = V(24^2 + 10^2)

d = V(576 + 100)

d = V676

d = 26 m (C)

6]

(3^-4 × 2^-3)/(2^-5 × 3^-2)

= (2^5 × 3^2)/(2^3 × 3^4)

= 2^(5-3) × 3^(2-4)

= 2^2 × 3^-2

= (2^2)/(3^2) (B)