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Andrei [34K]
3 years ago
9

Jillian is trying to save water, so she reduces the size of her square grass lawn by 8 feet on each side the area of the smaller

lawn is 144 square feet in the equation x-8^2=144, xrepresents the side measures the original lawn what were the dementions of the original lawn
Mathematics
2 answers:
Gnoma [55]3 years ago
7 0

20 x 20 is what the dimensions is

horsena [70]3 years ago
3 0

Answer: 20 feet by 20 feet.


Step-by-step explanation:

1. You know that x is the original measure of one side. Since it is a square, all its sides are equal.

2. Therefore, to solve the problem you only need to solve for x, as you can see below:

- You have that:

(a-b)^{2}=a^{2}-2ab+b^{2}

- Then, you obtain the following quadratic equation:

(x-8)^{2} =144\\x^{2}-2(x)(8)+8^{2}=144\\x^{2}-16x-80=0

- Apply the Quadratic formula to solve it:

x=\frac{-b+/-\sqrt{b^{2}-4ac}}{2a}\\a=1\\b=-16\\c=-80

- Then, you obtain:

x_1=20\\x_2=-4

3. The dimensions cannot be negative, therefore, the answer is: 20 feet by 20 feet.


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