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3 years ago

The area of square ABCD is 7cm². Show that x² + 4x = 3

Mathematics

1 answer:

soldier1979 [14.2K]3 years ago

4 0

Answer:

see explanation

Step-by-step explanation:

The area (A) of a square is calculated as

A = s² ( s is the measure of a side of the square )

Here s = x + 2 and A = 7, thus

(x + 2)² = 7 ← expand left side using FOIL

x² + 4x + 4 = 7 ( subtract 4 from both sides )

x² + 4x = 3 ← as required

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