0000:00:00:00:00Start15Number 15ExplanationAn equation is expressed in the form ∣x2x21∣=8\begin{vmatrix} x^2 & x \\ 2 & 1 \end{vmatrix} = 8x22x1=8. The possible values of xxx are...4 or −24 \text{ or } -24 or −2−4 or 2-4 \text{ or } 2−4 or 2−2 or 3-2 \text{ or } 3−2 or 32 or −32 \text{ or } -32 or −33 or 83 \text{ or } 83 or 8
15Number 15ExplanationAn equation is expressed in the form ∣x2x21∣=8\begin{vmatrix} x^2 & x \\ 2 & 1 \end{vmatrix} = 8x22x1=8. The possible values of xxx are...4 or −24 \text{ or } -24 or −2−4 or 2-4 \text{ or } 2−4 or 2−2 or 3-2 \text{ or } 3−2 or 32 or −32 \text{ or } -32 or −33 or 83 \text{ or } 83 or 8
