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## Tamilnadu Samacheer Kalvi 10th Maths Solutions Chapter 3 Algebra Ex 3.8

Question 1.

Find the square root of the following polynomials by division method

(i) x^{4} – 12x^{3} + 42x^{2} – 36x + 9

(ii) 37x^{2} – 28x^{3} + 4x^{4} + 42x + 9

(iii) 16x^{4} + 8x^{2} + 1

(iv) 121x^{4} – 198x^{3} – 183x^{2} + 216x + 144

Solution:

The long division method in finding the square root of a polynomial is useful when the degrees of a polynomial is higher.

Synthetic Division Calculator. The calculator will divide the polynomial by the binomial using synthetic division, with steps shown.

Question 2.

Find the square root of the expression \(\frac{x^{2}}{y^{2}}-10 \frac{x}{y}+27-10 \frac{y}{x}+\frac{y^{2}}{x^{2}}\)

Solution:

Question 3.

Find the values of a and b if the following polynomials are perfect squares

(i) 4x^{4} – 12x^{3} + 37x^{2} + bx + a

(ii) ax^{4} + bx^{3} + 361ax^{2} + 220x + 100

Solution:

(i)

Since it is a perfect square.

Remainder = 0

⇒ b + 42 = 0, a – 49 = 0

b = -42, a = 49

(ii) ax^{4} + bx^{3} + 361ax^{2} + 220x + 100

Since remainder is 0

a = 144

b = 264

Question 4.

Find the values of m and n if the following expressions are perfect squares

(i) \(\frac{1}{x^{4}}-\frac{6}{x^{3}}+\frac{13}{x^{2}}+\frac{m}{x}+n\)

(ii) x^{4} – 8x^{3} + mx^{2} + nx + 16

Solution:

(i)

(ii)

Since remainder is 0,

m = 24, n = -32