Question

Splitting the middle tearm :
40+3x-x^2

Answer 1

Answer:

-x^2+3x+40=0

-x^2+8x-5x+40=0

-x(x-8)-5(x-8)=0

(x-8)(-x-5)=0

x=8 or -5

Answer 2

Answer:

3x = 8x - 5x , x = 8 , x = -5

Step-by-step explanation:

P(x) = 40 + 3x - x²

⇒ 40 + 3x - x² = 0

⇒ 40 + 8x - 5x - x² = 0

⇒ 8( 5 + x ) - x( 5 + x ) = 0

⇒ ( 8 - x )( 5 + x ) = 0

⇒ x = 8 , x = -5