Find the product of x 7 x 7

Asked by maham237 @ 26/04/2021 in Mathematics viewed by 302 People

(x + 7)(x − 7).

Answered by maham237 @ 26/04/2021

Whenever a question asks you to multiply binomials, just remember FOIL.
Multiply FIRST terms with FIRST terms
Multiply OUTER terms with OUTER terms
Multiply INNER terms with INNER terms
Multiply LAST terms with LAST terms

first x first = (x)(x) = $x^{2}$
outer x outer = (x)(-7) = -7x
inner x inner = (7)(x) = 7x
last x last = (7)(-7) = -49
Now add all of the products up to get your final answer.
$x^{2}$ - 7x + 7x - 49 = $x^{2}$ - 49

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