x^(2)+18x+81

Factorise : 5x^(2) - 18x -8

The complete set of values of a for which the function f(x)=tan^(-1)(x^(2)-18x +a)gt 0 AA x in R is a. (81, infty) b. [81,infty) c. (-infty,81) d. (-infty,81]

Let two numbers have arithmatic mean 9and geometric mean 4 .Then these numbers are roots of the equation (a) x^(2)+18x+16=0 (b) x^(2)-18x-16=0 (c) x^(2)+18x-16=0( d) x^(2)-18x+16=0

Evaluate : -7x^(2) + 18x^(2) + 3x^(2) - 5x^(2)

Factorise the x ^(2) + 18x + 65

The function f(x)=x^(3)-(15)/(2)x^(2)+18x+2 increases in

int((5x^(2)-18x+17))/((x-1)^(2)(2x-3))dx

Find the intervals in which f(x)=2x^(3)-12x^(2)+18x+15 is increasing or decreasing.