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Reptile [31]
3 years ago
14

4x^2-5x-15=0 how to find the vertex and y intercept

Mathematics
1 answer:
mezya [45]3 years ago
5 0
ax^2+bx+c=0\\\\the\ vertex:\left(\frac{-b}{2a};\frac{-(b^2-4ac)}{4a}\right)\\\\y-intrcept=c\\=======================================\\\\4x^2-5x-15=0\\\\a=4;\ b=-5;\ c=-15\\\\\frac{-b}{2a}=\frac{-(-5)}{2\cdot4}=\frac{5}{8};\ \frac{-(b^2-4ac)}{4a}=\frac{-[(-5)^2-4\cdot4\cdot(-15)]}{4\cdot4}=-\frac{265}{16}\\\\\boxed{the\ vertex:\left(\frac{5}{8};-\frac{265}{16}\right)}\\\\\boxed{y-intercept:-15}
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Please anyone help me answer this question am giving the brainliest
DochEvi [55]

Answer:

(-3/2x+1) + (3/x-1)

Step-by-step explanation:

Dont put the answer in parenthesis, I just did that to seprate it so it was easier to read. If you need it to be put in word form for it to be easier for you to understand, its "negative three divided by two x plus one, plus 3 divided by x minus 1"

First, rewrite the expression as 3x+6/2x^2+x-2x-1

Then, factor the expression, 3x+6/x*(2x+1)-(2x+1) (*=multiply)

Then, write a new fraction for each factor in the denominator, then write a new fraction, 3x+6/(2x+1)*(x-1) to (A)/2x+1 + B/x-1)

Then write terms in the numerators, for now we will use A and B.

Now we set the sum of the fractions equal to the original fraction.

3x+6/(2x+1)*(x-1) = A)/2x+1 + B/x-1).

Then reorder and group the terms, giving you 3x+6=(A+2B)x+(-A+B).

Now equate the coefficiants, {6= -A+B, 3= A+2B

Then substitute back, (A, B)=(-3, 3)

Now finally, just rewrite the fraction. (-3/2x+1) + (3/x-1)

Hope this helps! Sorry its kind of long.

6 0
3 years ago
Mplify the expression:<br> | 5q + 84 - 94 + 84
Leto [7]

Answer:

5q+74

Step-by-step explanation:

84+84=168

168-94=74

7 0
3 years ago
What is the first quartile, Q1, of the data set?
Kryger [21]
It is 28 because you have to take the median out then go to the first set of data and find the median of that.
4 0
3 years ago
Which equation is equivlent to 7x/4 -3x/8=11
ArbitrLikvidat [17]

Answer:

8

Step-by-step explanation:

7x/4 -3x/8=11

lets simplify the left hand side 7x/4 -3x/8

first the lcm which is 8

(2)7x-3x/8 = 14x-3x/8 = 11x/8

11x/8 = 11

cross multiply

11x = 8 x 11

divide both sides by 11

x = (8x11)/11 = 8

4 0
3 years ago
PLS HELP ME ON THIS QUESTION I WILL MARK YOU AS BRAINLIEST IF YOU KNOW THE ANSWER PLS GIVE ME A STEP BY STEP EXPLANATION!!
Reptile [31]

Answer:

I don't know

Step-by-step explanation:

5 0
3 years ago
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