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OpenStudy (anonymous):
How would you write 5x^20-7x^10+15 in quadratic form?
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jimthompson5910 (jim_thompson5910):
hint: let z = x^10. Squaring both sides gives z^2 = x^20
jimthompson5910 (jim_thompson5910):
(x^10)^2 = x^(10*2) = x^20
OpenStudy (anonymous):
Hmm would it be -5(x^10)² - 7(x^10) + 15?
jimthompson5910 (jim_thompson5910):
then replace every x^10 with z
jimthompson5910 (jim_thompson5910):
the first 5 is positive and not negative
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OpenStudy (anonymous):
Can anyone help I'm stuck between the answers A and C.
jimthompson5910 (jim_thompson5910):
you didn't list the answer choices
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