(5x-14)(5x+14)-25x^2+9x-5 при x=70

Question

(5x-14)(5x+14)-25x^2+9x-5 при x=70

Answer 1

25х^2-196-25х^2+9х-5=0
-196+9х-5=0
Если х=70 то
-196+630-5=429

Answer 2

(5x-14)(5x+14)-25x^2+9x-5=25x^2-196-25x^2+9x-5=9x-201

Если х=70, то 9х-201=9*70-201=429