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Objectives: Solve equations of the form ax2 = k. Solve equations of the form ax2 = k where x is replaced by an algebraic expression. Standard Addressed: 2.8.11.N. Solve quadratic equations. The equation x2 = 9 can be stated as the question, “What number multiplied by itself is 9?” There are two such numbers, 3 and -3. Each of these is called a square root of 9. The positive square root of a number is called the principal square root. The principal square root of a number is indicated by the radical sign. In general, if x2= k and k > 0, then x = You can write this as , which is read as “plus or minus the square root of k.” x2 = 100 x = 10, -10 d. 4x2 = 25 x = 5/2, - 5/2 e. 49x2 = 16 x = 4/7, -4/7 (x + 7)2 = 81 x+7=9 x=2 x + 7 = -9 x = -16 4x2 = 240 X2 = 60 X = 7.75, -7.75 5x2 = 250 x2 = 50 X = 7.07, -7.07