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artcher [175]
3 years ago
15

Evaluate the expression for the given values: 2x^2 _8xy+3y^2 for x = -3 and y = 2

Mathematics
1 answer:
Ganezh [65]3 years ago
5 0

Answer:

Value = 78

Step-by-step explanation:

We replace the values, x = -3 and y = 2, so:

2x^{2} -8xy+3y^{2} =2(-3)^{2}-8(-3)(2)+3*2^{2}=2*9+48+3*4=18+48+12=78\\

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sergey [27]

Answer:

Charles practiced for the relay race for D. 9 hours last week.

Step-by-step explanation:

First, I would find the ratios the ratios for converting hurdle to javelin and javelin to relay.

Hurdle : Javelin ; 5 : 1.5

Javelin : Relay ; 2.5 : 5 or  1 : 2

Next, find the factors compared to the original numbers for hurdle to javelin.

15 / 5 = 3

To find the amount of javelin time they did, multiply 1.5 by the factor we got, 3.

1.5 * 3 = 4.5

Finally, double 4.5, since Charles does twice as much relay than he does javelin.

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Example A: a/2

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I WILL GIVE YOU 20 POINTS AND THE BRAINLYEST
fiasKO [112]

Answer/Step-by-step explanation:

✍️Slope of the line using two points, (2, 2) and (6, 10),

slope (m) = \frac{y_2 - y_1}{x_2 - x_1} = \frac{10 - 2}{6 - 2} = \frac{8}{4} = 2

✍️To find the equation of the line in slope-intercept form, we need to find the y-intercept (b).

Substitute x = 2, y = 2, and m = 2 in y = mx + b, and solve for b.

2 = (2)(2) + b

2 = 4 + b

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Substitute m = 2 and b = -2 in y = mx + b.

✅The equation would be:

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8 = 2a - 2

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Divide both sides by 2

\frac{10}{2} = a

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