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6. Find the area using suitable identity

If the rectangular cardboard is of dimension

(x + 7)

units and

(x - 30)

units, then find the area of the cardboard.

$x^{2} - 23 x - 210$
$x^{2} - 34 x - 216$
$x^{2} - 28 x - 208$
$x^{2} + 23 x + 210$

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