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Citrus2011 [14]
3 years ago
10

What substitution should be used to rewrite 4x^4-21x^2+20=0

Mathematics
1 answer:
Rufina [12.5K]3 years ago
5 0
You can use z = x², then rewrite the equation as
  4z²-21z+20 = 0
This factors as
  (4z-5)(z-4) = 0
so has solutions
  z = 5/4, 4

The solutions for x are then
  x = ±√z = {-2, -(√5)/2, (√5)/2, 2}
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In (A) statistics class Wilson's students earn a higher ratio of a's to b's.

<h3>What are ratios?</h3>
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To find the higher ratio:

Given -

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As we can observe that 3:5 < 11:15.

Therefore, in (A) statistics class Wilson's students earn a higher ratio of a's to b's.

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1 year ago
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Option B;
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