Ask question

Ask question

All categories

2 years ago

15

Solve for x. X2 - 20x+ 100 = 0

1 answer:

lianna [129]2 years ago

8 0

Answer:

X will equal 10 x=10

Step-by-step explanation:

First subtract 100 from both sides to get x^2-20x=-100 then find c. (-b/2)^2 is the formula. then c=100 so add 100 to both sides. x^2-20x+100=200. Then Factor. (x-10)^2=0 is what you should get. then do square root. x-10=0. So now add 10 to both sides and you get x=10. Tada!

You might be interested in

What are the real or imaginary solutions of each polynomial equation?

Semmy [17]

1) a
2) c

#1 explanation:

x^4-20x^2=-64
x^4-20x^2+64=0
(find a number that multiplies to the last number aka 64 and adds up to b aka 20)
((x-4)(x-16))^2
x= -2,2,-4,4

same for #2 w different variable and numbers

6 0

3 years ago

A number in expanded form is shown. 4×1+3×1/100+9×10+5×1/10

77julia77 [94]

The real answer is going to be 23.5

3 0

3 years ago

After heating up in a teapot, a cup of hot water is poured at a temperature of 204°F.

laila [671]

Answer:

Question 1: 0.081 min⁻¹

Question 2: 168ºF

Explanation:

The missing equation is:

$T=T_a+(T_0-T_a)e^{-kt}$

You are given:

Ta = the temperature surrounding the object = 73ºF
T₀ = the initial temperature of the object = 204ºF
t = 2.5 min
T after 2.5 min = 180ºF

Question 1: Find the the value of k.

Substitute the data into the equation and solve for k:

$180\º=73\º+(204\º-73\º)e^{-k\cdot 2.5min}\\ \\ 107\º=131\ºe^{-k\cdot 2.5min}\\\\-k\cdot 2.5min=\ln (107/131)\\\\k=0.081min^{-1}$

Question 2: Find the Fahrenheit temperature of the cup of water, to the nearest degree, after 4 minutes.

Subsititute into the formula and compute:

$T=73\ºF+(204\ºF-73\ºF)e^{-0.081min^{-1}\times 4min}\\ \\ T=73\ºF+(131\ºF)(0.72325024)\\\\T=168\ºF$

4 0

4 years ago

If each exterior angle of a regular polygon is 30°, find how many sides the polygon has & the measure of an

WITCHER [35]

Answer:

12 sides and measure of each interior angle is 150...

8 0

3 years ago

Read 2 more answers

un unitățile de măsurat lungimea mai mici decât unitatea principală sunt.......................... ................. Și.........

Alchen [17]

Answer:

english plz !!!!!!!!!!

Step-by-step explanation:

3 0

3 years ago