muntik na sana akong humanga kaso... bakit may positive at negative yung sagot niya? ahem... sometimes we do use both the positive and negative square roots; when we do so, we make it explicit by using the plus-or-minus sign (plus above minus, which Ill have to write as +-), as in the quadratic formula x = (-b +- sqrt(b^2 - 4ac))/(2a) other times it is clearly the positive square root that we want: for instance when we use the Pythagorean theorem to find the hypotenuse of a right triangle, c = sqrt(a^2 + b^2) LENGTHS ARE ALWAYS POSITIVE, so its the positive square root that we need. we want an expression to represent a single number (when values have been assigned to any variables in the expression). therefore, we want an operation on numbers to return a single number. for instance, if 2+3 had two different values at the same time, it would get very confusing--especially in expressions with more than one addition: 2+3+4 could have FOUR different values! therefore the operation square root should have a single value: the square root of 9 cant be *both* 3 and -3 #Bitterness #Kabaliwan #Nazi
Posted on: Mon, 28 Jul 2014 13:23:25 +0000
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