bantu jawab pake cara ya..

49)
p - q = (3x + 8)^2 = 9x^2 + 48x + 64

q = p - (9x^2 + 48x + 64)

=> p + q = (4x - 15)^2 = 16x^2 - 120x + 225
=> p + p - (9x^2 + 48x + 64) = 16x^2 - 120x + 225
=> 2p = 16x^2 - 120x + 225 + 9x^2 + 48x + 64
=> 2p = 25x^2 -72x + 289 (A)

50)
2x = akar (1 + 2(x^2 - 25))
(2x)^2 = 1 + 2(x^2 - 25)
4x^2 = 1 + 2(x^2 - 25)
4x^2 - 2(x^2 - 25) = 1
2(2x^2 - (x^2 - 25)) = 1
2(2x^2 - x^2 + 25) = 1
2(x^2 + 25) = 1
2x^2 + 50 = 1
(x^2 - 10x + 25) + (x^2 + 10x + 25) = 1
(x - 5)^2 + (x + 5)^2 = 1 (D)