2. If 4x2 + 20x + r = (2x + s)2 for all values of x,
what is the value of r-s?
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Answer:
just expand and equate coefficients
4x^2+20x+r = 4x^2+4sx+s^2
4s=20
s=5
r = s^2 = 25
r-s = 20
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