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A function 
s is defined as

s(x)=(x-4)(x-5)^(2)". A "
function 
h is defined as 
h(x)=(x-a)*s(x). For some constant 
a,(x-a)^(3) is a factor of 
h. What is 
s(a) ?

A function s s is defined as s(x)=(x4)(x5)2 s(x)=(x-4)(x-5)^{2} . A function h h is defined as h(x)=(xa)s(x) h(x)=(x-a) \cdot s(x) . For some constant a,(xa)3 a,(x-a)^{3} is a factor of h h . What is s(a) s(a) ?

Full solution

Q. A function s s is defined as s(x)=(x4)(x5)2 s(x)=(x-4)(x-5)^{2} . A function h h is defined as h(x)=(xa)s(x) h(x)=(x-a) \cdot s(x) . For some constant a,(xa)3 a,(x-a)^{3} is a factor of h h . What is s(a) s(a) ?
  1. Given: Given:\newlines(x)=(x4)(x5)2s(x) = (x-4)(x-5)^2\newlineh(x)=(xa)s(x)h(x) = (x-a)\cdot s(x)\newlineWe need to find s(a)s(a) given that (xa)3(x-a)^3 is a factor of h(x)h(x).
  2. Factor of h(x)h(x): Since (xa)3(x-a)^3 is a factor of h(x)h(x), it means that (xa)(x-a) is a factor of s(x)s(x) because h(x)=(xa)s(x)h(x) = (x-a)\cdot s(x).
  3. Calculate s(a)s(a): To find s(a)s(a), we need to substitute xx with aa in the expression for s(x)s(x):s(a)=(a4)(a5)2s(a) = (a-4)(a-5)^2
  4. Determine value of aa: However, before we calculate s(a)s(a), we need to determine the value of aa. Since (xa)3(x-a)^3 is a factor of h(x)h(x), and we know that h(x)=(xa)s(x)h(x) = (x-a)\cdot s(x), this implies that (xa)(x-a) must also be a factor of s(x)s(x) on its own.
  5. Factor s(x)s(x): We can factor s(x)s(x) to see if (xa)(x-a) appears as a factor:\newlines(x)=(x4)(x5)(x5)s(x) = (x-4)(x-5)(x-5)
  6. Determine aa: For (xa)(x-a) to be a factor of s(x)s(x), aa must be either 44 or 55 because those are the roots of s(x)s(x).
  7. Calculate s(5)s(5): Since (xa)3(x-a)^3 is a factor of h(x)h(x), and we already have (xa)(x-a) as a factor of s(x)s(x), (xa)(x-a) must be repeated three times in total. This means that aa must be 55 because (x5)(x-5) is already squared in s(x)s(x), and multiplying by (xa)(x-a) from h(x)h(x) would give us (xa)3(x-a)^322.\newlineNow that we have determined (xa)3(x-a)^3, we can calculate (xa)3(x-a)^3:s(5)=(54)(55)2s(5) = (5-4)(5-5)^2Perform the calculation:s(5)=(1)(0)2s(5) = (1)(0)^2s(5)=0s(5) = 0

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