Verify the Equation: (x+5)(x+3) = x²-3²

Question

(x+5)(x+3)=x232 (x+5)(x+3)=x^2-3^2

Is the equation a true or false statement?

Video Solution

Solution Steps

00:00 Is the equation correct?
00:21 Let's use the shortened multiplication formulas
00:35 Let's divide by the common factor
00:51 Let's reduce what we can
00:59 We can see that the expressions are not equal
01:02 And this is the solution to the question

Step-by-Step Solution

To assess whether the equation (x+5)(x+3)=x232(x+5)(x+3) = x^2 - 3^2 is a true or false statement, we follow these steps:

  • Step 1: Expand the left side using distributive property (FOIL).
  • Step 2: Simplify the expression.
  • Step 3: Simplify the right side.
  • Step 4: Compare both sides of the equation.

Step 1: Expand (x+5)(x+3)(x+5)(x+3):
(x+5)(x+3)=x(x+3)+5(x+3)(x+5)(x+3) = x(x+3) + 5(x+3)
=x2+3x+5x+15= x^2 + 3x + 5x + 15

Step 2: Simplify this expression:
x2+3x+5x+15=x2+8x+15x^2 + 3x + 5x + 15 = x^2 + 8x + 15

Step 3: Evaluate the right side:
x232=x29x^2 - 3^2 = x^2 - 9

Step 4: Compare x2+8x+15x^2 + 8x + 15 to x29x^2 - 9:
Clearly, x2+8x+15x29x^2 + 8x + 15 \neq x^2 - 9, as the former includes the terms 8x+158x + 15, while the latter is simply reduced by 9.

Therefore, the equation (x+5)(x+3)=x232(x+5)(x+3) = x^2 - 3^2 is a Lie (false statement) because the left and right sides do not match for any value of xx.

Answer

Lie