kiradaniel01
kiradaniel01 kiradaniel01
  • 25-09-2018
  • Mathematics
contestada

Factor completely.
25a^4-10a^2z^2-8z^4

Please really need help. I have been struggling with this for 20 min.

Respuesta :

tramserran
tramserran tramserran
  • 26-09-2018

25a⁴ - 10a²z² - 8z⁴  multiply 25*-8 = -200 to find factors (10*-20 = 200), (10 - 20 = -10)

25a⁴ + 10a²z²    - 20a²z² - 8z⁴     factor the left two and right two terms

5a²(5a² + 2z²)    -4z²(5a² + 2z²)   one factor from each side should be identical

= (5a² - 4z²)(5a² + 2z²)


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