Which equation results from isolating a radical term and squaring both sides of the equation for the equation sqrt x+6+ sqrt x =.8?
X+6 = 64-X
X+6=64+ x
X+6 = 64+ X-16sqrtx
x+6=64+x+16sqrtx

Statements reasons 1. ab ? cd; ad ? bc 1. given 2. ac ? ac 2. reflexive property 3. ? adc ? ? cba 3. ? 4. ? dac ? ? bca; ? acd ? ? cab 4. cpctc 5. ? dac and ? bca are alt. int. ? s; ? acd and ? cab are alt. int. ? s 5. definition of alternate interior angles 6. ab ? cd; ad ? bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?