Question

expand the following (x+3)(x-3)

Answer 1

Answer:

x² - 9

Step-by-step explanation:

Given

(x + 3)(x - 3)

Each term in the second factor is multiplied by each term in the first factor, that is

x(x - 3) + 3(x - 3) ← distribute both parenthesis

= x² - 3x + 3x - 9 ← collect like terms

= x² - 9

Answer 2

Answer:

x² - 9

Step-by-step explanation:

$(x + 3)(x - 3)$

Multiply each term in the first parentheses by each term in the second parentheses ( FOIL )

$x(x - 3) + 3(x - 3)$

Calculate the product

${x}^{2} - 3x + 3x - 3 \times 3$

Multiply the numbers

${x}^{2} - 3x + 3x - 9$

Since two opposites add up to zero, remove them from the expression

${x}^{2} - 9$

Hope this helps..

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