Question

Factorise y= -x2 + 6x + 20

Answer 1

Step-by-step explanation:

solution.

-x2 + 10x - 2x + 20 =

x ( -x + 10 ) +2 ( - x + 10 ) =

(-x+ 10) ( x+2)

therefore x = -2 or x= 10

Answer 2

Answer:

the polynomial has no real roots

Step-by-step explanation:

by the formula -b+or- sqrt of b^{2} -4ac /2a

and the nature of root of quadratic equation states that if b^{2} -4ac is less then 0 it has got no real root.

here, b^{2} -4ac = 36-80 < 0

therefore it doesnt have real roots ..