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2 years ago

3x^2-17x- 20 and 100=3x^2-17x-20 needed to simplify and find the X if its equal to 100

Mathematics

1 answer:

Vesnalui [34]2 years ago

4 0

Answer:

Factor 3x^2-17x-20, and you get (x + 1)(3 x - 20)

x = 17/6 + sqrt(1729)/6, x = 17/6 - sqrt(1729)/6

Step-by-step explanation:

Factor 3x^2-17x-20, and you get (x + 1)(3 x - 20)

When 3x^2-17x-20 is equal 100

3x^2-17x-20=100

Subtract both sides by 100

3x^2-17x-120=0

Use the quadratic formula

x = 17/6 + sqrt(1729)/6, x = 17/6 - sqrt(1729)/6

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kramer

Answer:

The solution to the system of equations be:

$x=3,\:y=-2$

Step-by-step explanation:

Given the system of equations

4x-2y = 16

y = -5x+13

Solving the system of equations using the substitution method

$\begin{bmatrix}4x-2y=16\\ y=-5x+13\end{bmatrix}$

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$14x-26 = 16$

Now isolate x for $14x-26 = 16$

$14x-26=16$

Add 26 to both sides

$14x-26+26=16+26$

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Divide both sides by 14

$\frac{14x}{14}=\frac{42}{14}$

Simplify

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Substitute x = 3

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