Al-I.6.4.S

© 2006 1 -2010 tutorco.com Are the following equations quadratic? If yes then write the equations in the general form (ax2 + bx + c = 0) 2x² − x = 0 0 = 2x2 + 4x 1 = x2 -4x + 3 6 – x (x2 + 2) = 0 0 = 5 + x2 7 = x – 6x TOPIC : LINEAR INEQUALITIES AND QUADRATIC FUNCTIONS Al-1/6/4/S © 2006 2 -2010 tutorco.com 9x = -2 x2 + 2X + 3 x² − 10 = 0 2x² = x x2 + 2 = x + 5 ( x + 4) (x -4) = x(x + 2) + 8 ( x + 2) (x -1) = 3 2(x -2)2 -6 = -2 x2 -3(x -3)2 = 2 © 2006 3 -2010 tutorco.com Check whether the given value is the solution of the given quadratic equation. a) 7x2 -63 = 0, x = 3 b) 3x2 -30 = 0 X = 3 c) 2x2 = 50 X = 5 d) 30x2 + 12 = 42 X = 1 © 2006 4 -2010 tutorco.com e) x2 -10x -11 = 0, x = 2 f) x2 + 12x = -20 X =2 g) x2 + 8x = -12 X = 3 h) x2 -4x -32 = 0 , x = 8