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I am supposed to write a quadratic equation using only the solutions and I am only given one solution:4.

It can't be (x-4)=0. Can I use 0 to make (x-4)(x+0)=0?

I would make 4 a double root, so then
(x-4)(x-4)=0
x^2 - 8x + 16 = 0

it is long and yellow

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