Factoring
sin 45 degrees (no calculator)
sqrt2/2
Geometry Distance Formula
D=sqrt[(x_2-x_1)^2+(y_2-y_1)^2]
The zero product property says that if a product is equal to zero then:
1. none of the factors equal 0.
what does that say about the solutions if b^2-4ac <0 in ax+bx^2+c = 0
What is there are no real solutions
Reference angle of 7pi/4
45 degrees