16-36=25-45 ^ Both giving -20 as result 16-36+^=25-45+V 4 4 Adding 114 to both sides to get two squares 16 36 81/4 25 45 81/4 42 - 2*4*(9/2) ♦ (9/2)2 » 52 - 2*5*(9/2) ♦ (9/?)^ a2 - 2*a*b ♦ b2 « (a - b)2 НЖ) . 9__ 9 4--= 5-— 2 2 -> Non-expanded form of the squares Square root and subtraction from