Which equation can be rewritten as x+4=x2? Assume x>0

Step 1: Subtract x^2 from both sides. x+4-x2 = x2-x2 - x2 + x + 4 = 0 Step 2: Use quadratic formula with a=-1, b=1, c=4. x = - b± b2 - 4ac 2a x = - (1) ± (1) 2 - 4 (-1) (4) 2 (-1) x = - 1±17 - 2 x = 12 + - 12 √17 or x = 12 + 12 √17 Answer: x = 12 + - 12 √17 or x = 12 + 12 √ 17