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a. 8a+4-(3a-5) = 8a+4-3a+5= 5a+9
b. a2+5a-(-3a2-9a)=a2+5a+3a2+9 =4a2+5a+9
Semoga Bermanfaat--
b. a^2+5a-(-3a^2-9a)= a^2+5a+3a^2+9a= 4a^2+14a
tanda (^) artinya pangkat ya..