Tolong dijawab bsk dikumpul....jwb secara detail supaya ngak bingung

jawab

1. (√3 +√7)(√3 - √7)/ (2√5- 4√2) =

= (3 - 7)(2√5 +  4√2) / (2√5 - 4√2)(2√5+ 4√2)
= (-4)/(-12) (2√5 + 4√2)
= 1/3 (2√5 + 4√2)


2. y = (p-3) x² - 2px + 2x + 8
y = (p-3) x²  +(-2p+2) x  +8
a= p-3
b = -2p + 2
c = 8

syarat menyinggung D = 0 --> b² - 4ac = 0
(-2p+2)² - 4(p-3)(8)   = 0
4p² - 8p + 4 - 32p + 96 = 0
4p² - 40p + 100 = 0
p² - 10 p + 25= 0
(p - 5)² = 0
p= 5