1.

2. If 4x2 + 20x + r = (2x + s)2 for all values of x,what is the value of r-s?​

Answer»

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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