b. 7x - 4 is the correct answer
Step-by-step explanation:
Given
Area of square = A = [tex]49x^2-56x+16[/tex]
Let s be the side of the square
Then
A = s^2
Putting the values we get
[tex]49x^2-56x+16=s^2[/tex]
Taking Square root on both sides
[tex]\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[/tex]
b. 7x - 4 is the correct answer
Keywords: Area, Polynomials
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