Solve (x+3)² = (x-3)²: Equal Squared Binomials

Solve the following equation:

(x+3)2=(x3)2 (x+3)^2=(x-3)^2

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:04 Let's use shortened multiplication formulas to open the brackets
00:14 Let's calculate the multiplications
00:24 Let's simplify what we can
00:37 Let's isolate X
00:43 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Solve the following equation:

(x+3)2=(x3)2 (x+3)^2=(x-3)^2

2

Step-by-step solution

Let's examine the given equation:

(x+3)2=(x3)2 (x+3)^2=(x-3)^2 First, let's simplify the equation, for this we'll use the perfect square formula for a binomial squared:

(a±b)2=a2±2ab+b2 (a\pm b)^2=a^2\pm2ab+b^2 ,

We'll start by opening the parentheses on both sides simultaneously using the perfect square formula mentioned, then we'll move terms and combine like terms, and in the final step we'll solve the resulting simplified equation:

(x+3)2=(x3)2x2+2x3+32=x22x3+32x2+6x+9=x26x+9x2+6x+9x2+6x9=012x=0/:12x=0 (x+3)^2=(x-3)^2 \\ \downarrow\\ x^2+2\cdot x\cdot3+3^2= x^2-2\cdot x\cdot3+3^2 \\ x^2+6x+9= x^2-6x+9 \\ x^2+6x+9- x^2+6x-9 =0\\ 12x=0\hspace{6pt}\text{/}:12\\ \boxed{x=0} Therefore, the correct answer is answer A.

3

Final Answer

x=0 x=0

Practice Quiz

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Solve the following equation:


\( 2x^2-8=x^2+4 \)

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