Which of the following quadratic equations has the solution set (-20,9)? select all that apply a. (x+20)(x-9)=0 b. (x-20)(x+9)=0 c. (x-5)(x-4)=0 d. x^2-9x+20=0 e. x^2-11x+180=0 f. x^2+11x-180

A, F

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.

step-by-step explanation:

. your answer will contain x - and y -terms. (1 point) x ( ¿¿ 2 − 7 ) 2 +( y 2 − 9 ) 2 √ ¿ 12. what is the distance from the directrix (the crocodile river) to the point ( x , y )? write this equation. your answer will contain a y -term.

1.true 2.false? ? i think. .

step-by-step explanation: