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# CBSE Class 10 Answered

Using division algorithm find the quotient and remainder of the following:

I) x³-6x²+11x-6 by x²+x+1

Asked by renuneeraj2005 | 02 Jun, 2020, 11:00: AM Expert Answer

We have

f(x) = x- 6x2 + 11x - 6 and g(x) = x2 + x + 1

Clearly, degree of f(x) = 3 and degree of g(x) = 2.

Therefore, the degree of quotient is q(x) = 3 - 2 = 1 and the degree of remainder is r(x) less than 2.

Let quotient q(x) = ax + b and remainder r(x) = cx +d.

Using division algorithm, we have

f(x) = g(x) × q(x) + r(x)

Comparing the coefficient of same powers of x on both sides, we get

a = 1  [Comparing the coefficient of x3]

a + b = -6  [Comparing the coefficient of x2]

a + b + c = 11  [Comparing the coefficient of x]

b + d = -6  [Comparing the constant terms ]

Solving the above equations, we get the following values:

a = 1, b = -7, c = 17, and d = 1

Quotient is q (x) = x - 7 and remainder is r(x) = 17x + 1

### (i) We have:f(x) = x3 - 6x2 + 11x - 6 and g(x) = x + 1Clearly, degree of f(x) = 3 and degree of g(x) = 1. Therefore, the degree of quotient is q(x) = 3 - 1 = 2 and the degree of remainder is r(x) = 0Let quotient q(x) = ax2 + bx + c and remainder r(x) = k.Using division algorithm, we havef(x) = g(x) × q(x) + r(x) Comparing the coefficient of same powers of x on both sides, we geta = 1  [Comparing the coefficient of x3]a + b = -6  [Comparing the coefficient of x2]b + c = -11  [Comparing the coefficient of x]c + k = -6  [Comparing the constant terms ]Solving the above equations, we get the following values:a = 1, b = -7, c = 18, and k = -24∴ Quotient is q (x) = x2 - 7x + 18 and remainder is r(x) = -24. (i) We have: f(x) = x3 - 6x2 + 11x - 6 and g(x) = x + 1 Clearly, degree of f(x) = 3 and degree of g(x) = 1. Therefore, the degree of quotient is q(x) = 3 - 1 = 2 and the degree of remainder is r(x) = 0 Let quotient q(x) = ax2 + bx + c and remainder r(x) = k. Using division algorithm, we have f(x) = g(x) × q(x) + r(x)   Comparing the coefficient of same powers of x on both sides, we get a = 1  [Comparing the coefficient of x3] a + b = -6  [Comparing the coefficient of x2] b + c = -11  [Comparing the coefficient of x] c + k = -6  [Comparing the constant terms ] Solving the above equations, we get the following values: a = 1, b = -7, c = 18, and k = -24 ∴ Quotient is q (x) = x2 - 7x + 18 and remainder is r(x) = -24.

Answered by Renu Varma | 03 Jun, 2020, 10:39: AM

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