Question

9th grade maths 13 the chapter

show that the triangle of maximum area that can be inscribed in a circle is an equilateral triangle

Sum the series 1 + 3 – 5 + 7 + 9 – 11 + 13 + 15 – 17 …… to 3n terms.

1.3+3.5+5.7+......+(2n-1)(2n+1)=n/3(4n²+6n-1)

I want to learn

answer the 1 question 

Ex 7.2 Q39 

• Meaning of worth 

f(x) = 4x + 5 and g(x) = 9x − 4

f − g

(f − g)(x) =

Let A = {1,2,3,4,5,6} define a relation R from A to A by R={(x,y)/y=x+1} .write image of 6 and pre-image of 4.