Question

If y=x^2+3x-1 then dy/dx is
a) 2x+3
b) 2x-3
c) 2x
d) 3x-1​

Answer 1

EXPLANATION.

⇒ y = x² + 3x - 1.

As we know that,

Differentiate both sides w.r.t x, we get.

⇒ dy/dx = d(x² + 3x - 1)/dx.

⇒ dy/dx = 2x + 3.

Option [A] is correct answer.

                                                                                                               

MORE INFORMATION.

(1) d/dx (sin x) = cos x.

(2) d/dx (cos x) = - sin x.

(3) d/dx (tan x) = sec²x.

(4) d/dx (cosec x) = - cosec x cot x.

(5) d/dx (sec x) = sec x tan x.

(6) d/dx (cot x) = - cosec²x.