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Find the unknown.$$x^{2}+20=0$$

$$\pm 2 \sqrt{5} i$$

Algebra

Chapter 0

Reviewing the Basics

Section 2

Solving Equations of the Form $a x^{2}-b=0$

Equations and Inequalities

Missouri State University

Campbell University

University of Michigan - Ann Arbor

Lectures

01:45

Find the unknown.$$(5 …

00:30

Solve.$$x^{2}+20 x…

00:54

Solve.$$2 x^{2}-20=0$$…

00:22

Solve.$2 x^{2}-20=0$

01:06

Find the unknown.$$x^{…

00:56

it's clear. So a name right here. So here we're going to calculate for X and Equation X square plus 20 is equal to zero. So first thing we're gonna do is subtract 20 on both sides. To get X square is equal to negative 20 and then we're going to square root both sites when we get square root of X square is equal to square root of negative one times four times five, which becomes square root of negative one times the square root of four times the square root of five and practically. This becomes an X, and we know that. So it's look right here that X square is eat equal to negative one thing X is equal to plus or minus I, which is an imaginary number. So we did plus minus. This becomes a two. And this just days has squared of five. So we have to squirt of five. Hi,

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