The perimeter of a rectangular plot of land is 84 metres and its area is 320m2. What are the dimensions of the plot?Record your answers from smallest to largest separated by a comma. (ie. −1.1,2.7,9.8 ) If there are no real roots then write 'no solution' in the blank.□
Q. The perimeter of a rectangular plot of land is 84 metres and its area is 320m2. What are the dimensions of the plot?Record your answers from smallest to largest separated by a comma. (ie. −1.1,2.7,9.8 ) If there are no real roots then write 'no solution' in the blank.□
Perimeter Equation: Let's denote the length of the rectangle as L and the width as W. The perimeter P of a rectangle is given by P=2(L+W). We are given that the perimeter is 84 meters.So, we have the equation:2(L+W)=84
Solve for L+W: Divide both sides of the equation by 2 to solve for L+W:L+W=42
Area Equation: We are also given that the area A of the rectangle is 320 square meters. The area of a rectangle is given by A=L×W.So, we have the equation:L×W=320
Express W in terms of L: Now we have a system of two equations:1) L+W=422) L×W=320We can express W in terms of L from the first equation:W=42−L
Quadratic Equation in L: Substitute W=42−L into the second equation:L×(42−L)=320Expand the equation:L2−42L+320=0
Quadratic Formula: Now we have a quadratic equation in terms of L. We can solve for L using the quadratic formula, where a=1, b=−42, and c=320. The quadratic formula is given by: L=2a−b±b2−4ac
Calculate Discriminant: Calculate the discriminant b2−4ac:Discriminant=(−42)2−4(1)(320)=1764−1280=484
Two Real Solutions for L: Since the discriminant is positive, we have two real solutions for L. Calculate the square root of the discriminant: 484=22
Calculate Square Root: Now, plug the values into the quadratic formula to find the two solutions for L:L=242±22
Two Possible Values for L: Calculate the two possible values for L:L1=242+22=264=32L2=242−22=220=10
Find Corresponding Widths: Now we have two possible lengths for the rectangle: L1=32 meters and L2=10 meters. Using the equation W=42−L, we can find the corresponding widths:W1=42−32=10 metersW2=42−10=32 meters
Dimensions of the Rectangle: We have found the dimensions of the rectangle: 32 meters by 10 meters. Now let's solve the quadratic equation x2+6x+17=0. We can use the quadratic formula again, where a=1, b=6, and c=17.
Solve Quadratic Equation: Calculate the discriminant for the quadratic equation:Discriminant = (6)2−4(1)(17)=36−68=−32
Calculate Discriminant: Since the discriminant is negative, there are no real roots for the quadratic equation x2+6x+17=0.
More problems from One-step inequalities: word problems