Question

A. (3x-2)(4x+5) b. (9p-5q)2 c. (x+5)(x2+6x-4)

Answer 1

A.  (3x-2) (4x+5) 
   = (3x) (4x) + (3x)(5) + (-2) (4x) + (-2)(5)
  = 12x² + 15x -8x -10
= 12x²-7x-10

B. (9p-5q) 2
   = (9p ) 2  + (-5q) 2
  = 18p -10q

C  .  (x+5) (x²+6x-4)
  = (x)(x²) +(x) (6x) + (x) (-4)+(5)(x²)+ (5)(6x) + (5) (-4)
 = x³ +6x² -4x+ 5x² +30x -20
= x³ +(6x²+5x²)+ (-4x+30x) - 20
= x³ +11x² + 26x -20