intermediate algebra

hopen2impov

Junior Member
Joined
Aug 4, 2010
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66
evaluate

2x^2y -xz^3 for x= -3 y= 1 z= 3

2(-3)^2(1) -(-3)(3)^3
2(-9) (1) -(-3)(27)
-18*1 -81
-18-81
ANSWER 63
 
hopen2impov said:
evaluate

2x^2y -xz^3 for x= -3 y= 1 z= 3

2(-3)^2(1) -(-3)(3)^3
2(-9) (1) -(-3)(27) <<< incorrect (-3)[sup:2j6586hf]2[/sup:2j6586hf] = 9 NOT (-9)
-18*1 -81 <<< Incorrect -(-3)3[sup:2j6586hf]3[/sup:2j6586hf]= -(-3)*27 = -(-81) = 81 NOT -81
-18-81
ANSWER 63
 
2x^2y -xz^3 for x= -3 y= 1 z= 3
2(-3)^2(1) -(-3)3^3
2(9) (1)+(3) (27)
18*1 *+81
18+81= 99
 
I got to be more careful with the signs, i wish i had your brain. Thank you for your help. I will try to be more attentive to my work.
 
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