Question

I need Help please! Evaluate the "expression" for a= -1, b= 9 and c= -2. b^2–4ac.

Answer 1

-170

Explanation:

- 2(9)^2-4(-1)(-2)

-2(81)-4(2)

-162-8

-170

Answer 2

b²-4ac. When a= -1 b= 9 c= -2

Substitute the values a,b and c in the equation

=9²-4(-1)(-2)

=81-4(2) note that -1*-2= 2

=81-8

=73