Question

A rectangle's sides are extended by 3 m. The new area of the figure is given by the expression: a(x) = $x^2+7x+4$. $x$ is the extension of sides. What is the new area ?

• A. 14 square meters
• B. 24 square meters
• C. 34 square meters
• D. 54 square meters

Answer 1

The correct option is C

34 square meters

a(x) = $x^2+7x+4$

Plug in $x=3$

a(3) = $3^2+7\times 3+4$

a(3) = 9 + 21 + 4

a(3) = 34 square meters