Question

X cm

2 cm
В.
A
C
x cm
The area of square ABCD is 7 cm?.
Show that x2 + 4x = 3
2 cm
+
A
D
Look at pic

Answer 1

Explanation:

x×x=x²

2×x=2x

2×x=2x

2×2=4

Add like terms to make the equation:

`x^(2) +4x+4=7`

So:

`x^(2) +4x=3`