Significant figures rules addition subtraction multiplication division

Step-by-step explanation:

Your answer cannot be MORE precise than the least precise measurement. For addition and subtraction, look at the places to the decimal point. Add or subtract in the normal fashion, then round the answer to the LEAST number of places to the decimal point of any number in the problem.

When adding and subtracting values, consider the value with the fewest decimal places; when multiplying and dividing, consider the value with the fewest significant figures.

Step-by-step explanation:

let's call the solutions x₁ = (5 - 2√7)/3 and x₂ = (5 + 2√7)/3

then the equation is (x-x₁)(x-x₂) = 0

if you fill that in you get a lot of numbers which you can recognize as ax²+bx+c=0.

step-by-step explanation:

you can see that a=1 (there is just an x²)

b = (-5 -2√7 + 2√7 - 5)/3 = -10/3

c = -2√7)/3 ) * (-5+2√7)/3) = -1/3

so your answer is 3x^2 – 10x – 1 = 0