Answer:
I believe that something is missing.
Step-by-step explanation:
He drank 420 cups of water in one month
There would be no real solution because something times a number twice does not equal a negative
b. 7x - 4 is the correct answer
Step-by-step explanation:
Given
Area of square = A = ![49x^2-56x+16](https://tex.z-dn.net/?f=49x%5E2-56x%2B16)
Let s be the side of the square
Then
A = s^2
Putting the values we get
![49x^2-56x+16=s^2](https://tex.z-dn.net/?f=49x%5E2-56x%2B16%3Ds%5E2)
Taking Square root on both sides
![\sqrt{49x^2-56x+16}=\sqrt{s^2}\\s=\sqrt{49x^2-56x+16}\\s=\sqrt{(7x)^2-2(7x)(4)+(4)^2}\\Using\ formula\ a^2-2ab+b^2=(a-b)^2\\s=\sqrt{(7x-4)^2}\\s=7x-4](https://tex.z-dn.net/?f=%5Csqrt%7B49x%5E2-56x%2B16%7D%3D%5Csqrt%7Bs%5E2%7D%5C%5Cs%3D%5Csqrt%7B49x%5E2-56x%2B16%7D%5C%5Cs%3D%5Csqrt%7B%287x%29%5E2-2%287x%29%284%29%2B%284%29%5E2%7D%5C%5CUsing%5C%20formula%5C%20a%5E2-2ab%2Bb%5E2%3D%28a-b%29%5E2%5C%5Cs%3D%5Csqrt%7B%287x-4%29%5E2%7D%5C%5Cs%3D7x-4)
b. 7x - 4 is the correct answer
Keywords: Area, Polynomials
Learn more about polynomials at:
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