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2(x/2 + 1/x)²
= 2( (x/2)² + 2(x/2)(1/x) + (1/x)² )
= 2(x²/4 + 1 + 1/x²)
= ½x² + 2 + 2/x²
25.
K = 2(p + l)
p + l = K/2
3x - 2 + x + 5 = 38/2
4x + 3 = 19
4x = 19 - 3
x = 16/4
x = 4
lebar = 4 + 5 = 9 cm
26)
8(x + y)p - 12(x + y)q
= (8 - 12)(x + y)(8-12)(p -q)
= -4(x + y)(2p - 3q)
27)
(2x - 3)² - (y + 7)²
= (2x - 3 - y - 7)(2x - 3 + y + 7)
= (2x - y - 10)(2x + y + 4)
nomor 29 dan 30 mana fotonya?