If a + b = x and a - b = y , then 3ab =
can someone explain!	Select the correct option:  A) (3x^2 - 3y^2)/4  B) (3y^2 - 3x^2)/4  C) 3x+3y/2  D) 3x - 3y/2  E) 3x^2 - 3y^2/2
plugging numbers is quite fast in this case:   Let   a=1   b=2   Then; x= 1+2= 
<gadget id="calculator">1+2</gadget>
<output>3</output>
&gt; 3 and Y= 1-2=&gt; -1   Question asks 3ab=.........   As our number 3ab= 3*1*2= 
<gadget id="calculator">3*1*2</gadget>
<output>6</output>
6   now plug the value of x and y in the answer choices. Option A gives 6 and that is the number we need.   Hence: (3x^2 - 3y^2)/4ns is (3x^2 - 3y^2)/4.
<result>A</result>
If a + b = x and a - b = y , then 3ab =
can someone explain!