+0  
 
-1
73
3
avatar+392 

Let $M=4a^2 - 2b^2 +a$. Let $j$ be the value of $M$ when $a=5$ and $b=3$, and let $k$ be the value of $M$ when $a=-1$ and $b=4$. Calculate $j+2k$.

 Apr 6, 2020
 #1
avatar+111329 
+1

Let $M=4a^2 - 2b^2 +a$. Let $j$ be the value of $M$ when $a=5$ and $b=3$, and let $k$ be the value of $M$ when $a=-1$ and $b=4$. Calculate $j+2k$.

 

j  =  4(5)^2  - 2(3)^2 +5  =  100 - 18  + 5  =  87

 

k  = 4(-1)^2  - 2(4)^2  +  5  =  4 - 32  + 5  =  -23

 

j + 2k   =

 

87  +  2(-23)  =

 

87  - 46  =

 

41

 

 

cool cool cool

 Apr 6, 2020
 #2
avatar+392 
0

i think its wrong

Paresh  Apr 6, 2020
 #3
avatar+631 
0

Can you find the error? Hint: It's the value of k


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