Question

2-11 assignment: lessons 1 and 2 practice
possible points: 9.09
4.
a. diego squared a number and got 4. andre squared a different number and got 4. what were the numbers that diego and andre squared?
b. jada squared a number and got -4. elena squared a different number and got -4. what were the numbers that jada and elena squared?
a. ______ (separate your answers with commas and no spaces)
b. ______ (separate your answers with commas and no spaces)

Explanation:

Step1: Find Diego's numbers

Let the number be $x$. We solve $x^2=4$. Taking square roots: $x=\pm\sqrt{4}=\pm2$.

Step2: Find Jada/Elena's numbers

Let the number be $y$. We solve $y^2=-4$. Using imaginary numbers: $y=\pm\sqrt{-4}=\pm2i$.

Answer:

a. 2,-2
b. 2i,-2i