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Andreyy89
3 years ago
13

Which equals the product of (x – 3)(2x + 1)

Mathematics
2 answers:
vodka [1.7K]3 years ago
7 0

Answer:

2 {x}^{2}  - 5x - 3

Step-by-step explanation:

( x - 3)(2x + 1) \\  = x(2x + 1) - 3(2x + 1) \\  = 2 {x}^{2}  + x - 6x - 3 \\ =  2 {x}^{2}  - 5x - 3

alekssr [168]3 years ago
6 0

Answer:

Step-by-step explanation:

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<em>Answer</em>

B) y = 3

<em>Step-by-step explanation</em>

Given the system of equations:

\begin{gathered} 3x+2y=12\text{ \lparen eq. 1\rparen} \\ 5x-y=7\text{ \lparen eq. 2\rparen} \end{gathered}

Isolating x from equation 1:

\begin{gathered} 3x+2y-2y=12-2y \\ 3x=12-2y \\ \frac{3x}{3}=\frac{12-2y}{3} \\ x=\frac{12}{3}-\frac{2}{3}y \\ x=4-\frac{2}{3}y\text{ \lparen eq. 3\rparen} \end{gathered}

Substituting equation 3 into equation 2 and solving for y:

\begin{gathered} 5(4-\frac{2}{3}y)-y=7 \\ 5\cdot4-5\cdot\frac{2}{3}y-y=7 \\ 20-\frac{10}{3}y-y=7 \\ 20-\frac{13}{3}y=7 \\ 20-\frac{13}{3}y-20=7-20 \\ -\frac{13}{3}y=-13 \\ (-\frac{3}{13})\cdot-\frac{13}{3}y=(-\frac{3}{13})\cdot-13 \\ y=3 \end{gathered}

6 0
1 year ago
Write an exponential function for graph that passes through the following points (-3,80);(-1,20)
padilas [110]

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y

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b

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±

1

2

Two equations seem to be possible here. Plug both values of

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The only valid function is

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=

4

(

1

2

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7 0
3 years ago
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Therefore, temperature at noon = (-8 + 14)°F = 6°F

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4 0
3 years ago
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