Math, asked by hmdshourov9, 5 months ago

prove that, g(a2)= g(a-2)

Answers

Answered by tiny777
0

Answer:

Three points are needed on the parabola

x = 0, y = 20

x = -600, y = 170

x = +600, y = 170

using the form ax^2 + bx + c = y, we know that c=20

x=-600, y = 170 and x =+600, y = 170; write two equations

-600^2a - 600b + 20 = 170

+600^2a + 600 + 20 = 170

use elimination

360000a - 600b + 20 = 170

360000a + 600b + 20 = 170

------------------------------addition eliminates b

720000a + 40 = 340

720000a = 300

a = 300/720000

a = .0004167

Now we can write the equation

y = .0004167x^2 + 20

Graphically

+graph%28+300%2C+200%2C+-700%2C+700%2C+-100%2C+200%2C+.0004167x%5E2%2B20%2C+170%2C+116%29+

:

"How high is the cable 120m away from a tower? "

600 - 120 = 480

Solve for x=480

y = .0004167(480^2) + 20

y = 96 + 20

y = 116 m high (blue line)

Step-by-step explanation:

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