Question

find the roots of x2-9x+14=12

Answer 1

Answer:

obtain zeros P(x)=x

2

+9x+14

→ for zeros find P(x) = 0

x

2

+9x+14=0

x

2

+7x+2x+14=0

x(x+7)+2(x+7)=0

(x+7)(x+2)=0

x=−7 or x=−2

zeros is -7 & -2

→P(−7)=(−7)

2

+9(−7)+14

=+49−63+14

=0

→P(−2)=(−2)

2

+9(−2)+14

=4−18+14

=0