78.74 divided by 12.7 is equivalent to 7874 divided by 12.70, 78.74/12.7=7874÷1270=6.200 calculating 3 decimle places

We can use the quadratic formula to solve this problem.

You've already listed the values for 'a', 'b', and 'c', so just plug them into the formula:

Simplify:

Multiply:

Subtract:

Take the square root:

It doesn't matter if you add or subtract something with 0, you'll end up with the same thing, so we have:

**Answer:**

F /r = k

**Step-by-step explanation:**

F=kr

Divide each side by r

F/r=kr/r

F /r = k

(2√5+3√7)(2√5+3√7) = (2√5)(2√5) + (2√5)(3√7) + (3√7)(2√5) + (3√7)(3√7)

(2√5+3√7)(2√5+3√7) = 4(5) + 6√35 + 6√35 + 9(7)

(2√5+3√7)(2√5+3√7) = 20 + 12√35 +63

(2√5+3√7)(2√5+3√7) = 83 + 12√35

**Answer: 83 + 12√35**