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Let u and v be the solutions to 3x^2 + 5x + 7 = 2x^2 + 11x - 6. Find u/v^2 + v/u^2.

 Jul 17, 2024
 #1
avatar+1950 
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First, let's simplify the equation. We have

x26x+13

 

Since the constant is equal to uv, we have the equation

uv=132uv=26

 

The coefficient of x is equal to u+v, so we have

u+v=6

 

Squaring both sides of the equation, we have the equation

u2+2uv+v2=36u2+26+v2=36u2+v2=10

 

Now, it's time for the fun part of this problem. We can simplify what we want to figure out to

We already know all these terms! We can easily find them! We have

u3+v3=(u+v)(u2+v2uv)=(6)(1013)=18[uv]2=[13]2=169

 

So, The answer is u/v2+v/u2=[u3+v3]/[uv]2=18/169

Thanks! :)

 Jul 18, 2024
edited by NotThatSmart  Jul 18, 2024

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