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Help how do I do this

 

Let f(a,b) = 2a - 3b^2 + 7.  If f(k,-3) = -10 + 4f(k,-5), then what is k?

 Dec 21, 2023
 #1
avatar+126978 
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2k - 3(-3)^2  + 7  =  -10  +  4 ( 2k -3(-5)^2  + 7)

 

2k - 27 + 7  = -10   + 4 ( 2k - 75 + 7)

 

2k -27 + 7 =  -10 + 8k - 300 + 28

 

2k -20  =  8k - 282

 

262  = 6k

 

262 / 6  =  k  =  131 / 3

 

 

cool cool cool

 Dec 22, 2023

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