How do you factor the expression $4x^2 - 49$ ?

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Answer 1 · 2016-01-06T14:24:05

(2x - 7 )(2x + 7 )

$(a^2 - b^2 ) = (a - b )(a + b )$

is called a difference of 2 squares as both values in the expression are perfect squares. It is factored as shown.

here a = 2x and b = 7

$rArr 4x^2 - 49 = (2x - 7 )(2x + 7 )$

How do you factor the expression 4x^2 - 494x^2 - 49?