A wheelchair ramp has a length of 265 inches. The horizontal length of

the ramp is 241 inches more than the vertical height of the ramp.
The height of the ramp, h, in inches, can be determined from the equation
265 = √ℎ
2 + (ℎ + 241)
2.
What is the height of the ramp?
A) 12 inches
B) 23 inches
C) 253 inches
D) 264 inches

1 answer

To find the height of the ramp \( h \), we can start by using the given equation:

\[ 265 = \sqrt{h^2 + (h + 241)^2} \]

We will first square both sides to eliminate the square root:

\[ 265^2 = h^2 + (h + 241)^2 \]

Calculating \( 265^2 \):

\[ 265^2 = 70225 \]

Now substituting into the equation:

\[ 70225 = h^2 + (h + 241)^2 \]

Next, we expand \((h + 241)^2\):

\[ (h + 241)^2 = h^2 + 2 \cdot h \cdot 241 + 241^2 \]

Calculating \( 241^2 \):

\[ 241^2 = 58081 \]

Now substituting back into the equation gives us:

\[ 70225 = h^2 + h^2 + 2 \cdot 241 \cdot h + 58081 \]

Combining terms:

\[ 70225 = 2h^2 + 482h + 58081 \]

Subtract \( 58081 \) from both sides:

\[ 70225 - 58081 = 2h^2 + 482h \]

Calculating \( 70225 - 58081 \):

\[ 12144 = 2h^2 + 482h \]

Rearranging gives us:

\[ 2h^2 + 482h - 12144 = 0 \]

To simplify the equation, we can divide everything by 2:

\[ h^2 + 241h - 6072 = 0 \]

Now we can use the quadratic formula:

\[ h = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \]

Where \( a = 1 \), \( b = 241 \), and \( c = -6072 \).

Calculating \( b^2 - 4ac \):

\[ b^2 - 4ac = 241^2 - 4(1)(-6072) = 58081 + 24288 = 82369 \]

Now we take the square root:

\[ \sqrt{82369} = 287 \]

Now substituting back into the quadratic formula:

\[ h = \frac{-241 \pm 287}{2} \]

Calculating the two possible values:

\[ h = \frac{-241 + 287}{2} = \frac{46}{2} = 23 \]

\[ h = \frac{-241 - 287}{2} = \frac{-528}{2} = -264 ; (\text{not a valid height}) \]

Thus the height of the ramp \( h \) is:

\[ \boxed{23 \text{ inches}} \]