Question

write the following in roaster form: A={x:x^2-4x-5=0}​

Answer 1

Answer:

A={x : x²–4x–5=0}

A={x : x²–5x+x–5=0}

A={x : x(x–5)+1(x–5)=0}

A={x : (x–5)+(x+1)=0}

⇒A={x : x = –1, 5}

∴ A={–1, 5} [in roster form]

Answer 2

answer is -1 and 5

hope it helps!