First find the area of the rectangle by multiplying the length and width of the rectangle, so 12 x25=300. Then find the area of the triangle, which is length x height/ 2. So 8 x 25=200/2=100. Then add the two answers together to get 400.
The mistake is in Step 1. The solver should have also squared when squaring the other side of the equation.
<h3>Correctly solving</h3>
There is approximately 1 solution for this equation