Question

if (x-5) (x+3) = x² + ax -15, then
the value of a is​

Answer 1

Answer:

(x-5) (x+3) = x² + ax -15

LHS -  (x-5) (x+3)

          x² + 3x -5x - 15

           x² -2x - 15

RHS - x² + ax -15

Comparing LHS and RHS,

x² -2x - 15 =  x² + ax -15

we get, a = -2