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3 years ago

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

Mathematics

1 answer:

sweet-ann [11.9K]3 years ago

6 0

<h3>Answer:</h3>

A, F

<h3>Step-by-step explanation:</h3>

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.

___

Multiplying the two factors gives ...

... (x +20)(x -9) = x² +11x -180

This selects answer F and eliminates choices D and E.

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tino4ka555 [31]

Answer:

Step-by-step explanation:

4^3+7=4^10

5 0

3 years ago

What are the restrictions of the domain of the function F(x) = 1/x^2-9

Sonbull [250]

$f(x)=\frac{1}{x^2-9}$

The denominator can't be equal to 0.
$x^2-9 \not= 0 \\
x^2 \not= 9 \\
x \not= -3 \ \land \ x \not= 3$

The domain is all numbers except -3 and 3.
$x \in \mathbb{R} - \{-3, 3 \}$

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3 years ago

Factor the polynomial completely. 4x3 – 12x2 7x – 21 4x2(x – 3) 7(x – 3) Which is the completely factored polynomial? 4x2(x 4) 3

bixtya [17]

Answer:

(d) (4x² +7)(x -3)

Step-by-step explanation:

This polynomial can be factored by factoring pairs of terms.

= (4x³ -12x²) +(7x -21)

= 4x²(x -3) +7(x -3)

= (4x² +7)(x -3)

<em>Additional comment</em>

The answer choices suggest we're not interested in irrational or complex factors. The quadratic (4x² +7) could be factored into linear terms involving irrational complex numbers. The form for "difference of squares" would be used for the purpose.

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2 years ago

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miv72 [106K]

Step-by-step explanation:

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3 years ago

What is 2/3 x 6 in simplest form?

iris [78.8K]

Answer:

It's 4

Step-by-step explanation:

every integer is the rational number, so, a whole number 6 can be written as 6/1. 2/3 x 6 = 12/3 as simplified as 4/1 in fraction form.

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