Question

1. subtract 9xy from 9xy

2. Subtract the sum of (8a – 6a^2 + 9) and (-10a -8 + 8a^2) from -3

3. Multiply 6ab by 4cd

4. Find the product of ab*cd*ef

5. 4a(3a + 7b) = ?

6.Find the product of 24x^2(1 - 2x) and evaluate it for x = 2.

7.(5x + 7)(3x +4) = ?

8.9/14 + ? = -1 *

9. 36/5 * 20/-3 =​

Answer 1

Answer:

1. subtract 9xy from 9xy,

9xy-9xy=0

Answer:- zero.

2. Subtract the sum of (8a – 6a^2 + 9) and (-10a -8 + 8a^2) from -3 ,

-3-{8a – 6a^2 + 9)+ (-10a -8 + 8a^2)}

=-3-{1-2a + 2a^2}

=-3-1+2a-2a^2

=(-4+2a-2a^2)

Answer :-(-4+2a-2a^2)

3. Multiply 6ab by 4cd ,

6ab * 4cd=24abcd

Answer:-24abcd

4. Find the product of ab*cd*ef =abcdef

Answer:-abcdef

5. 4a(3a + 7b) = 12a^2+28ab

Answer:-12a^2+28ab

6.Find the product of 24x^2(1 - 2x) and evaluate it for x = 2.

24x^2(1 - 2x)=24x^2- 48x^3,

now, for x=2,

24x^2(1 - 2x)=24*2^2(1-2*2) =24*4*(1-4) =(-288)

7.(5x + 7)(3x +4) = 15x^2+29x+21x+28=15x^2+50x+28

8.9/14 + ? = -1

now, let,

9/14 + x= -1

x=-1-(9/14) =(-14-9) /14=(-23/14)

9/14 + (-23/14) = -1

9. 36/5 * 20/-3 =(-12*4)=(-48)