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SAT MATH · Quadratics & Parabolas · Standard

Quadratics & Parabolas: The roots of math are math and math. Find math.

Factoring, vertex form, discriminant.

Try the problem

The roots of

x^2+bx+20=0

are

-4

and

-5

. Find

b

.

Hint and answer

Concept to use

$\Delta=b^2-4ac$.

Hint

The sum of roots is

-b

.

Answer

9

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