a) x²-3x+1=(-3)²-3*(-3)+1=9+9+1=19
b) 5+y(y+9)=5+(-12)*(-12+9)=5+36=41
c) (a+5)(b-10)=(-5+5)(12-10)=0
d)2a²-b(a+1)=2*(-2)²-5(-2+1)=8+5=13
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a) x²-3x+1=(-3)²-3*(-3)+1=9+9+1=19
b) 5+y(y+9)=5+(-12)*(-12+9)=5+36=41
c) (a+5)(b-10)=(-5+5)(12-10)=0
d)2a²-b(a+1)=2*(-2)²-5(-2+1)=8+5=13