tolong dijawab pake jalan dong.... pleaseee terimakasih

2. √75 = 5√3
√12 = 2√3
√27 = 3√3
Maka 5√3 + 2√3 - 2√3 + 3√3 = 8√3 (C)

4. f(x) = x^2 + 5x - 15 dan g(x) = x + 2

(fog)(x) = f(gx)
= (x+2)^2 + 5(x+2) - 15
= x^2 + 4x + 4 + 5x + 10 - 15
= x^2 + 9x - 1 (B)

Maaf cuma tau 2 nomor
Semoga membantu

1]

[(2x^-5 y^3)/(8x^3 y^-2)]^2

= [(2x^-5 y^3)/(2^3 x^3 y^-2)]^2

= [2^-2 x^-8 y^5]^2

= 2^-4 x^-16 y^10

= (y^10)/(2^4 x^16)

= (y^10)/(16x^16) (C)


2]
V75 + 2V3 - V12 + V27
= V(25×3) + 2V3 - V(4×3) + V(9×3)
= V25V3 + 2V3 - V4V3 + V9V3
= 5V3 + 2V3 - 2V3 + 3V3
= 8V3 (C)

3]
7 log 4 . 2 log 5 + 7 log 49/25
= 7 log 4 . 2 log 5 + 7 log 49 - 7 log 25
= 7 log 2^2 . 2 log 5 + 7 log 7^2 - 7 log 5^2
= 2 . 7 log 2 . 2 log 5 + 2 . 7 log 7 - 2 . 7 log 5
= 2 . 7 log 5 + 2 (1) - 2 . 7 log 5
= 2 . 7 log 5 + 2 - 2 . 7 log 5
= 2 (B)

4]
f(x) = x^2 + 5x - 15
g(x) = x + 2

(f○g)(x)
= f(g(x))
= f(x + 2)
= (x + 2)^2 + 5(x + 2) - 15
= x^2 + 4x + 4 + 5x + 10 - 15
= x^2 + 9x - 1 (B)