Question

please give me answer fast​

Answer 1

Answer:

Step-by-step explanation:

1. (c) -10b^3

2. (c) -83

3x + 2y = 7       ..(i)

xy = 11               ...(ii)

Square on both sides in the equation (i)

(3x + 2y)^2 =(7)^2

9x^2 + 4y^2 + 12xy = 49

9x^2 + 4y^2 + 12(11) = 49

9x^2 + 4y^2 = 49 - 132

9x^2 + 4y^2 = -83              (and this is what we wanted to find)

3. (d) 15xy^2

4. (a) 5y                   [Double check this one from someone else]

5. (b) Rs 180

6. (c) 4xy

(x + y)^2 - (x - y)^2

[x^2 + y^2 + 2xy] - [x^2 + y^2 - 2xy]

x^2 + y^2 + 2xy - x^2 - y^2 +2xy

= 4xy

Hope this helps