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U10= 10²-2.10 U11= 11²-2.11
= 100 - 20 = 121 -22
= 80 = 99
U10+U11 = 80+99
= 179 (A)
10.) (x-2) (3x+4)
= 3x²+4x-6x-8
= 3x²-2x-8 (C)
11.) 3x-6 = x+10 ,maka nilai x+15 adalah
3x-6 = x+10
3x-x = 10+6
2x = 16
x = 16/2
x = 8
Jadi, nilai x+15
= 8 + 15
= 23 (D)