What is the least common denominator (LCD) for these fractions?

The difference between the roots of the quadratic equation x^2−14x+q=0 is 6. Find q.

lara31 [8.8K]

Answer:

q=-1128/169

Step-by-step explanation:

x²n-14x+q=0 here a=1, b= -14, c=q

let the roots of the equation beα and β

then the sum of the roots= S= α+β= -b/a=-(-14)/1=14

α+β=14 ⇒β=14-α--------(i)

product of the roots=P= αβ= c/a= q/1=q------(ii)

since α-β=6--------(given)----(iiI)

put the values of β from equation i to equation iii

α-14α=6

-13α=6

α=-6/13

put the values of α and β in eq. (ii)

αβ=q=(-6/13)(14-(-6/13)

q=(-6/13)(182+6/13)

q=(-6/13)188/13

q=-1128/169

7 0

3 years ago

Read 2 more answers

What is the decimal of 1/10

zysi [14]

0.1 is the decimal equivalent.

5 0

3 years ago

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PLEASE HELP!

skad [1K]

the length of z is C. 15 cm

5 0

3 years ago

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An ant moves 18 millimeters every 5 seconds

vaieri [72.5K]

Answer:

Step-by-step explanation:

First we need to find their rate of speed.

r = d / t

For ant,

Convert millimeters to inches.

1 inch = 25.4 mm

18 mm = 0.7 inch

r = 0.7 / 5

r = 0.14 inches per second

For beetle,

r = 8 / 3

r = 2.7 inches per second

From the rates, you can tell that the beetle crosses the Garden first.

To know how long it takes for the ant to cross is by dividing the length by the rate.

1 yard = 36 inches

13 yards = 468 inches

468 ÷ 0.14 = 668.5 ≈ 669 seconds

In terms of minutes:

11 minutes and 15 seconds

The ant would cross the garden in 11 minutes and 15 seconds (or 669 seconds <em>up to you</em>).

7 0

2 years ago

A trough has ends shaped like isosceles triangles, with width 5 m and height 7 m, and the trough is 12 m long. Water is being pu

Svet_ta [14]

Answer:

$\dfrac{dh}{dt}=21 \text{m/min}$

the rate of change of height when the water is 1 meter deep is 21 m/min

Step-by-step explanation:

First we need to find the volume of the trough given its dimensions and shape: (it has a prism shape so we can directly use that formula OR we can multiply the area of its triangular face with the length of the trough)

$V = \dfrac{1}{2}(bh)\times L$

here L is a constant since that won't change as the water is being filled in the trough, however 'b' and 'h' will be changing. The equation has two independent variables and we need to convert this equation so it is only dependent on 'h' (the height of the water).

As its an isosceles triangle we can find a relationship between b and h. the ratio between the b and h will be always be the same:

$\dfrac{b}{h} = \dfrac{5}{7}$