x² + 5x + 10 = 0
What two numbers multiply to get 10 and add to get 5? (1,10)? (2,5)? No.
There are none, so go to the quadratic formula to get the answers.
(-b±√(b²-4ac))/2a
(-5±√(25-40))/2 {{Uh-oh. Negative determinant, so no real answers at all.}}
(-5±√-15)/2
Answers are (-2.5 + 1.9365i) and (-2.5 - 1.9365i) ■
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you would first do 10+5x-5=0, then 5x+5=0 and is factored by 5(x+1)=0. or if you want to know what x equals with, x=-1
-7
15
(1, 0)
5x - y + 1 = 0