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3 years ago

10

Evaluate -3x^2-4x=-1

1 answer:

Butoxors [25]3 years ago

5 0

Use the Quadratic formula,

x= -b +/- sqrt(b^2-4ac)
-------------------------
2a

x= 4 +/- sqrt(16+12)
----------------------
-6

x = 4+/- sqrt(28)
---------------
-6

x = 4 +/- 2*sqrt(7)
------------------
-6

x= 2(2+/- sqrt(7))
------------------
2(-3)

x= 2+/- sqrt(7)
--------------
-3

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Consider the line 7x+9y=5

alisha [4.7K]

Answer:

The slope of a line parallel to this line will be: -7/9

The slope of the perpendicular line will be:

$\frac{-1}{\frac{-7}{9}}=\frac{9}{7}$

Step-by-step explanation:

We know the slope-intercept form

$y=mx+b$

Here,

m is the slope

b is the y-intercept

Given the equation

$7x+9y=5$

simplifying to write in the lope-intercept form

$y=-\frac{7}{9}x+\frac{5}{9}$

Thus, the slope of the line is: -7/9

The slope of a line parallel to the line:

We have already determined that the slope of the line is: -7/9

We know that the parallel lines have the same slope.

Thus, the slope of a line parallel to this line will be: -7/9

The slope of a line perpendicular to the line:

We have already determined that the slope of the line is: -7/9

As we know that the slope of the perpendicular line is basically the negative reciprocal of the slope of the line.

Thus, the slope of the perpendicular line will be:

$\frac{-1}{\frac{-7}{9}}=\frac{9}{7}$

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