Wie rechnen Sie mit x ^ 2-9 ?
Antworten:
(x-3)(x+3)
Erläuterung:
x^2-9" is a "color(blue)"difference of squares"
"and in general factorises as"
•color(white)(x)a^2-b^2=(a-b)(a+b)
"here "a=x" and "b=3
rArrx^2-9=(x-3)(x+3)
(x-3)(x+3)
x^2-9" is a "color(blue)"difference of squares"
"and in general factorises as"
•color(white)(x)a^2-b^2=(a-b)(a+b)
"here "a=x" and "b=3
rArrx^2-9=(x-3)(x+3)