Solve the equation.
-$$x ^ { 2 } = 20$$
A) $\pm 4 \mathrm { i } \sqrt { 5 }$

B) $\pm 2 \mathrm { i } \sqrt { 5 }$

C) $\pm 4 \sqrt { 5 }$

D) $\pm 2 \sqrt { 5 }$

Question

Solve the equation.
-$$x ^ { 2 } = 20$$
A) $\pm 4 \mathrm { i } \sqrt { 5 }$

B) $\pm 2 \mathrm { i } \sqrt { 5 }$

C) $\pm 4 \sqrt { 5 }$

D) $\pm 2 \sqrt { 5 }$

Quizplus · Accepted Answer

To solve the equation $x^2 = 20$, take the square root of both sides, which gives $x = \pm \sqrt{20}$. Simplifying $\sqrt{20}$ gives $\sqrt{4 \cdot 5} = \sqrt{4} \cdot \sqrt{5} = 2\sqrt{5}$, so the solutions are $\pm 2\sqrt{5}$.

Solve the Equation x2=20x ^ { 2 } = 20x2=20 A) ±4i5\pm 4 \mathrm { i } \sqrt { 5 }±4i5​

Solve the Equation $x ^ { 2 } = 20$ A) $\pm 4 \mathrm { i } \sqrt { 5 }$