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icang [17]
3 years ago
9

WILL MARK BRAINLIEST AND RATE 5 STARS, PLEASE HELP, 50 POINTS

Mathematics
2 answers:
Xelga [282]3 years ago
8 0
You're using inverse operation to solve this equation. Now you just have to think about it. What number plus 20 would equal the same number squared? The answer would be 5, since
5+20=5^2
25=25
 The statement above is true :)
Another number that would work for the equation would be x= -4
-4+20=-4^2
16=16
The statement above is also true so your answer would be x=-4 and 5
KATRIN_1 [288]3 years ago
8 0

"I am going to explain this using the substitution method, considering it appears to be the best in this situation.We know (from the bottom equation) that y can equal 3x+20. Using this knowledge, we substitute the y in the top equation for 3x+20. Now, we have an equation that looks like this:3x+20=x^2+2xNow we need to move x to one side and then do some radicals (square roots).Subtract the 2x on the right (since it is smaller, negatives = NONONO), which will give youx+20=x^2Now, we take the square root of both sides to get rad(x+20)=xNow we have to simplify. 20 doesn't have a square root, but 4 goes into 20, and 4 has a square root of 2. This now becomes2rad(x+5)"

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-10x = -210 how would i find this answer?
jeka94

To find the answer to -10x=-210 you must divide -210 by -10

-210/-10= 21

Therefore x=21

So the proper equation is -10(21)=-210

3 0
3 years ago
Read 2 more answers
The axis of symmetry for the graph of the function f(x) = 3x2 + bx + 4 is x = 3/2 . What is the value of b?
kvasek [131]
The axis of symmety is the x value of the vertex

to find the x value of the vertex of ax^2+bx+c=0
x value=-b/2a

3x^2+bx+4=0
3/2=vertex

-b/2(3)=3/2
-b/6=3/2
times 6
-b=18/2
-b=9
times -1
b=-9
6 0
3 years ago
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For the function f(x)=5x^2-7x, what is f(-3)?
Ainat [17]

Answer:

24

Step-by-step explanation:

f(x)=5x^2-7x

substitute x to 3

f(3)=5(3)^2-7(3)

f(3)=5(9)-21

f(3)=45-21

f(3)=24

4 0
3 years ago
Two cyclists, 55 miles apart, start riding toward each other at the same time. One cycles 5 miles per hour faster than the other
tangare [24]

Answer:

r = 6 mph and f = 11 mph

Step-by-step explanation:

Representations:  

1) speed of faster cyclist:  f = r + 5

2) speed of slower cyclist:  r

Distances covered:

(r + 5)(5 hr) + r(5) = 55 mi (total distance covered)

Then 5r + 25 + 5r = 55, or, after reducing this equation:

r + 5 + r = 11, or

2r = 6

Then r = 6 mph and f = 11 mph

8 0
3 years ago
How do you convert 14x + 19y = 20 into slope intercept form?
nevsk [136]

Subtract 14x from both sides. Then divide both sides by 19

14x + 19y = 20\\\\19y = 20-14x\\\\19y = -14x+20\\\\y = \frac{-14x+20}{19}\\\\y = \frac{-14x}{19}+\frac{20}{19}\\\\y = -\frac{14}{19}x+\frac{20}{19}\\\\

The equation is now in slope intercept form y = mx+b

m = -14/19 is the slope

b = 20/19 is the y intercept

6 0
3 years ago
Read 2 more answers
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