Question

Which of the following quadratic equations has the solution set (-20,9)? SELECT ALL THAT APPLY

Answer 1

Answer:

A, F

Step-by-step explanation:

When the roots are a and b, the factors are (x-a) and (x-b). For roots -20 and 9, the factors are (x+20) and (x-9).

This selects answer A and eliminates choices B and C.

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Multiplying the two factors gives ...

... (x +20)(x -9) = x² +11x -180

This selects answer F and eliminates choices D and E.