SOLVE THE QUADRATIC EQUATION TO 3 SIGNIFICANT FIGURES

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3x^2 - 9x + 1 = 0

The quadratic equation is

So 'a' is 1

'b' is -9

'c' is 1

Substitute the values into the equation, once with the '+' and once with the '-'

You should get and

To 3 s.f your answers would be 2.88 and 0.116

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square root

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.