Verify the Equation: (-4-x)(7+x) = -28-11x-x²

Is equality correct?

(4x)(7+x)=2811xx2 (-4-x)(7+x)=-28-11x-x^2

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Are the expressions equal?
00:04 Let's properly open parentheses, multiply each factor by each factor
00:22 Let's calculate the multiplications
00:39 Let's group the factors
00:46 Let's compare the terms of the expressions, we'll see they're equal
00:51 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Is equality correct?

(4x)(7+x)=2811xx2 (-4-x)(7+x)=-28-11x-x^2

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Expand the expression on the left side using the distributive property

  • Step 2: Simplify the expanded expression

  • Step 3: Compare the simplified expression with the given expression on the right side

Now, let's work through each step:
Step 1: Expand using the distributive property. We apply the formula: (a+b)(c+d)=ac+ad+bc+bd(a+b)(c+d) = ac + ad + bc + bd.

For (4x)(7+x)(-4-x)(7+x), distribute each term:
(4)(7)+(4)(x)+(x)(7)+(x)(x)(-4)(7) + (-4)(x) + (-x)(7) + (-x)(x)

Step 2: Simplify the terms:
284x7xx2-28 - 4x - 7x - x^2
Combine like terms: 2811xx2-28 - 11x - x^2

Step 3: Compare this with the given expression 2811xx2-28 - 11x - x^2. Both sides of the equation are identical, indicating the expressions are equivalent.

Therefore, the solution to the problem confirms the expressions are equal, and the correct choice is Yes.

3

Final Answer

Yes

Practice Quiz

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\( (3+20)\times(12+4)= \)

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