Exercise 2 Page 613

To find the value of $x$ and the dimensions of the given triangle, recall that the area of a triangle is found by taking one half of the base multiplied by the height. We know that the area is $A=80{\text{ cm}}^2,$ the height is $h=x\text{ cm},$ and the base is $b=2x+4\text{ cm}.$

Solving for $x$

We can create an equation to solve for $x$ by substituting the given expressions into the formula for the area of a triangle.