It depends upon the equation that you are trying to solve.
for example if you had x² + y² - 4x - 6y = 3
completing the square (in both x and y) would give you (x - 2)² - 4 + (y - 3)² - 9 = 3
at which point you could collect the numbers together on the right to give you (x - 2)² + (y - 3)² = 16 = 4²
and then "read off" the centre of the circle at (2, 3) and its radius of 4.
However, I suspect that you are asking regarding a quadratic, in which case you have got to something like (x - w)² - r = 0
Just proceed as normal with an equation to solve:
(x - w)² - r = 0
→ (x - w)² = r
→ x - w = ±√r
→ x = w ±√r
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For a quadratic of the form ax² + bx +c this gives:
ax² + bx + c = 0
→ x² +(b/a)x + (c/a) = 0
completing the square:
→ (x + (b/2a))² - (b/2a)² + c/a = 0
→ (x + (b/2a))² = b²/4a² - 4ac/4a²
→ (x + (b/2a))² = (b² - 4ac)/4a²
→ x + (b/2a) = ±√((b² - 4ac)/4a²)
→ x = -(b/2a) ±(√(b² - 4ac))/2a
→ x = (-b ±√(b² - 4ac))/2a
which you may recognise as the formula for solving a quadratic equation.
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It is the number that youve hat to square to get to that number.
Youve got to be kidding me.
If available, offer them a raincheck.
680... Think of it like 70 percent of 100 is 70. So times this by 4 equals 280. So plus 280 to 400 and youve got 680!
how thick is the paper? example-1mm thick paper (1x2x2x2x2x2x2x2 ect. till youve multiplied 50 times and that equals the thickness in millimeters, all you have to do them is convert the millimeters into miles