Question

Aflați necunoscuta!
a × a = 98

Answer 1

a² = 98

a₁ = 7√2

a₂ = -7√2

Answer 2

$a \cdot a=98 \\ a^2=98 \\ a= \sqrt{98} \Rightarrow a=7 \sqrt{2} \\ a=- \sqrt{98} \Rightarrow a=-7 \sqrt{2}$