Question

if the side of a square are length by 3 cm the area becomes 121 CM square find the perimeter of the original square​

Answer 1

Answer:

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your answer is here !

Step-by-step explanation:

let x = side of the original square

then

(x+7) = side of the larger square which = 121 sq/cm

we can write this like this:

(x+7)^2 = 121

FOIL

x^2 + 14x + 49 = 121

:

x^2 + 14x + 49 - 121 = 0

:

x^2 + 14x - 72 = 0

Factor

(x + 18)(x - 4) = 0

Positive solution

x = 4 cm, size of the original square

:

:

Check: (4+7)^2 = 121

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