9th Grade math help

Morning Folks!!! guys i am here with grade 9 math simple problems which will be as useful and full of information as you found my post which was for 7th grade math problems.

Problem No1:-

Adding the polynomial 3x4 – 4x2 + 5x + 3 and 4x + 7x3 – 6x2 – 1.

Solution:

Use the associative property and distributive properties we get the

(3x4 – 4x2 + 5x + 3) + (7x3 – 6x2 + 4x – 1) = 3x4 + 7x3 – 4x2 – 6x2 + 5x + 4x + 3 – 1

= 3x4 + 7x3 – (4+6)x2 + (5+4)x + 2

= 3x4 + 7x3 – 10x2 + 9x + 2.

Look at the following method which is very helpful when adding two polynomials

3x4 +0x3– 4x2 + 5x + 3

0x4 + 7x3 – 6x2 + 4x – 1

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3x4 + 7x3– 10x2 + 9x + 2

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Problem No2:-



Diameter of the garden is 9.8 find the area?

Solution:

Diameter, d = 9.8 m. Therefore, radius r = 9.8 /2 = 4.9 m

Area of the circle = ╥ *R*R

= 3.14*4.9*4.9

= 75.46 m2

Let me come back with you with some help to my grade 10 math friends very soon until then keep :-)...