LikhoPadho

1. If x² +1/x² = 18 Find the value of x +1/x

2. If a - b = 3 and a² + b² =35. Find the value of ab

3. Simplify :- 9015 x 8985

4.  Divide 15x² -29xy + 8y² by 3x - y

5.  Solve 9x² - 49y² ÷ 3x - 7y

6.  Simplify :-  (3x² - 7y²)² and choose the correct ans
a. 9x⁴ + 49y² + 42x²y²
b. 9x⁴ + 49y⁴ + 42x²y²
c. 9x⁴ + 49y⁴ - 42x²y²
d. 3x⁴ + 49y² + 42x²y²

7.  The identities which are obtained by multiplying one binomial with another binomial are called 

8. Which of the following is correct ?
a. (a- b)² = a² + 2ab - b² 
b. (a- b)² = a² + 2ab + b² 
c. (a- b)² = a² - 2ab + b² 

9.  If x - 1/x = √5, find the value of x⁴ +1/x⁴ 

10.  Evaluate using identity :- (8.7)² - (1.3)²