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The polynomials p(t)=4t³-st²+7andq(t)=t²+st+8 leave the same …

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The polynomials p(t)=4t³-st²+7andq(t)=t²+st+8 leave the same remainder when divided by (t-1).find the value of s
  • 1 answers

Yogita Ingle 4 years, 10 months ago

Remainder theorem: If a polynomial P(x) is divided by (x-c), then the remainder is equal to P(c).

The given polynomial are

{tex}p(t)=4t^3-st^2+7{/tex}

{tex}q(t)=t^2+st+8{/tex}

Using remainder theorem the remainder of {tex}\frac{p(t)}{t-1} {/tex}is p(1) and the remainder of{tex} \frac{q(t)}{t-1}{/tex} is q(1).

Substitute t=1 in the given functions.

{tex}p(1)=4(1)^3-s(1)^2+7\Rightarrow 4-s+7=11-s{/tex}

{tex}q(1)=(1)^2+s(1)+8=1+s+8=9+s{/tex}

It is given that if p(t) and q(t) divided by (t-1), then the remainder is same.

p(1)=q(1)

Substitute these values.

11-s=9+s

Add s on both sides.

11=9+s+s

11=9+2s

Subtract 9 from both sides.

11-9=2s

2=2s

Divide both sides by 2.

1=s

Therefore, the value of s is 1.

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