Question

Упростите выражение: (х+5)(х-5) - (х-1)².

Answer 1

(x+5)*(x-5) - (x-1)² = x² - 25 - (x² - 2x + 1) = x² - 25 - x² + 2x - 1 = 2x - 26 .

Answer 2

(x+5)(x-5)-(x-1)²=x²-25-(x²-2x+1)=x²-25-x²+2x-1=2x-26