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50
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avatar+193 

Given that $3x^2-2(x^2+4)=42$, what is the value of $x^4$?

 Feb 11, 2021
 #1
avatar+2225 
+2

First solve this!

3x^2-2x^2-8=42 (expanding)

x^2=50

This means x=the square root of 50.

The square root of 50 to the fourth power is 2500.

 Feb 11, 2021

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