Optional extension A $22\text{ cm}$ by $18\text{ cm}$ frame has a uniform border of width $x$

Question

Optional extension A $22\text{ cm}$ by $18\text{ cm}$ frame has a uniform border of width $x$ cm. The border area is $144\text{ cm}^2$. $22\text{ cm}$ $18\text{ cm}$ $x$

Accepted Answer

(a) $22-2x$ cm (c) $x=2$ cm (d) $64$ cm. (b) $x^2-20x+36=0$ (shown).

Uniform photo-frame border

Uniform photo-frame border

Solution:

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