Move ray BC so that the measure of ABC is 38° How do you know that ABC is now 38° for this
problem?
*Careful- be sure you're making ZABC 38° and not
DBC!
138
D
B
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Y = x2 – 3x – 10

roots are x intercepts on form of (x,0)
Let's solve the quadratic equation
y = x2 – 3x – 10
(x-5)(x+2)
x=5,-2
roots: (5,0)(-2,0)
let's see of these are correct
y = x2 – 3x – 10
y=(5)^2-3 (5)-10
y=25-15-10
y=10-10
y=0

y = x2 – 3x – 10
y=(-2)^2-3 (-2)-10
y=4+6-10
y=10-10
y=0

the roots are correct