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If 
64x^(2)+px+81=(8x+q)^(2), where 
p and 
q are positive constants, what is the value of 
(p)/(q) ?

If 64x2+px+81=(8x+q)2 64 x^{2}+p x+81=(8 x+q)^{2} , where p p and q q are positive constants, what is the value of pq \frac{p}{q} ?

Full solution

Q. If 64x2+px+81=(8x+q)2 64 x^{2}+p x+81=(8 x+q)^{2} , where p p and q q are positive constants, what is the value of pq \frac{p}{q} ?
  1. Expand equation: We have the equation: \newline64x2+px+81=(8x+q)2 64 x^{2}+p x+81=(8 x+q)^{2} \newlineExpand the right side of the equation (8x+q)2(8x+q)^{2} to get 64x2+16qx+q264x^2 + 16qx + q^2.
  2. Compare coefficients: Compare the coefficients of the corresponding terms on both sides of the equation. We have 64x264x^2 on both sides, so they match. \newlineNow, compare the linear term and the constant term. We have pxpx on the left side and 16qx16qx on the right side, so p=16qp = 16q. \newlineFor the constant terms, we have 8181 on the left side and q2q^2 on the right side, so q2=81q^2 = 81.
  3. Find qq: Since q2=81q^2 = 81 and qq is a positive constant, we take the positive square root of 8181 to find qq. \newlineTherefore, q=9q = 9.
  4. Find pp: Substitute q=9q = 9 into the equation p=16qp = 16q to find the value of pp. \newlineSo, p=16×9=144p = 16 \times 9 = 144.
  5. Calculate pq\frac{p}{q}: Now that we have both pp and qq, we can find the value of pq\frac{p}{q}. \newlineSo, pq=1449\frac{p}{q} = \frac{144}{9}. \newlineSimplify the fraction 1449\frac{144}{9} to get the final value of pq\frac{p}{q}. \newlineTherefore, pq=16\frac{p}{q} = 16.