Question

7. Check whether a-2a2 +30 -18 is exactly divisible by a-3 or not.
8. What must be added to 6y + 4y+-27y3 - 7y2-27y-6 so that the result is exactly divisible by 2y?--
9. The area of a rectangle is x + 7x+12. If its breadth is (x+3), then find its length.
(1) (z+ 5)2 =22​

Answer 1

Answer:

7) we can find remainder by putting a=3

3-2(3)^2+30-18

3-18+30-18

33-36

-3

not divisible

8) 6y+4y-27y^3-7y^2-27y-6/2y

10y/2y-27y^3/2y-7y^2/2y-27y/2y-6/2y

5-27/2y^2-7/2y-27/2-6/2y

last term-6/2y must be removed

therefore 6 must be added to expression

9)

x^2+7x+12

factorize it

(x+3)(x+4)

x+3 is breadth therefore x+4 is length

10)

z+5=22/2

z+5=11

z=11-5

z=6