Question

упростите выражение(а-10)²-(а-5)(а+5)

Answer 1

(а-10)²-(а-5)(а+5)=а²-2*а*10+10²-(а²-5²)=а²-20а+100-а²+25=-20а+125

Answer 2

$(a - 10) {}^{2} - (a - 5)(a + 5) = a {}^{2} - 20a + 100 - {a}^{2} + 5a - 5a - 25 = 20a + 75$