Question

answer for all this questions​

Answer 1

Answer:

1) Like fractions :- 3/8, 2/9

Unlike fractions :- 15/2, 7/3, 10/3

Mixed fractions :- 2 1/2, 10 3/2

2) 1569.16 = 1×10^3 + 5×10^2 + 6×10^1 + 9×10^0 + 1×10^-1 + 6×10^-2

3) -125

4) 7/8

5) Example 1.) 9x^2 + 12xy + 4y

Example 2.) 5y^2 + 3x - 3

6) 3x^2 + 2x + 5

7) (7x^2 + 5x + 2) + (5x^2 + x + 7)

=> 7x^2 + 5x^2 + 5x + x + 2 + 7

=> 12x^2 + 6x + 9

8) (7x^2 + 4x^2y - 7xy^2 - 5y^2) - (3x^2 + 4x^2 + 5xy^2 - y^2)

=> 7x^2 + 4x^2y - 7xy^2 - 5y^2 - 3x^2 - 4x^2y + 5xy^2 + y^2

=> 7x^2 - 3x^2 + 4x^2y - 4x^2y - 7xy^2 + 5xy^2 - 5y^2 + y^2

=> 4x^2 - 2xy^2 - 4y^2

9) (a + b)^2 = a^2 + b^2 + 2ab

10) (3x + 5) (3x + 4)

Using the property (x + a) (x + b) = x^2 + (a + b)x + ab

(3x + 5) (3x + 4) => (3x)^2 + (3x + 4)x + 3x*4 => 9x^2 + 3x^2 +4x +12x

=> 12x^2 + 16x (answer)

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