1.FACTORISE i) 4x2+28x+49 ii) 28x2-41x+12 iii) 25x2-10x+1-36y2 iv) x3+x-3x2-3 v) 27x3+64 vi) 125x3+y3 vii) 8x3-( 2 x y )3 viii) x4- x plz may have all these ans. as their is a problem while i m doing the sums Share with your friends Share 0 Manbar Singh answered this i 4x2 + 28x + 49= 2x2 + 2 × 2x × 7 + 72 as a2 + 2ab + b2 = a + b2= 2x + 72= 2x + 7 2x + 7iiI think the question is : 28x2 - 41x - 12 instead of 28x2 - 41x + 12 28x2 - 41x - 12= 28x2 - 48x + 7x - 12= 4x 7x - 12 + 1 7x - 12= 7x - 12 4x + 1iii 25x2 - 10x + 1 - 36y2= 25x2 - 10x + 1 - 36y2= 25x2 - 5x - 5x + 1 - 36y2= 5x 5x - 1 - 1 5x - 1 - 36y2= 5x - 1 5x - 1 - 36y2= 5x - 12 - 6y2= 5x - 1 + 6y 5x - 1 - 6y= 5x + 6y - 1 5x - 6y - 1 iv x3 + x - 3x2 - 3= x3 - 3x2 + x - 3= x3 - 3x2 + x - 3= x2 x - 3 + 1 x - 3= x - 3 x2 + 1v 27x3 + 64= 3x3 + 43= 3x + 4 3x2 - 3x × 4 + 42 as a3+b3=a + b a2 - ab + b2= 3x + 4 9x2 - 12x + 16vi 125x3 + y3= 5x3 + y3= 5x + y 5x2 - 5x × y + y2 as a3+b3=a + b a2 - ab + b2 vii 8x3 - 2xy3= 2x3 - 2xy3= 2x - 2xy 2x2 + 2x × 2xy + 2xy2 as a3-b3=a - b a2 + ab + b2 = 2x 1 - y 4x2 + 4x2y + 4x2y2= 2x 1 - y 4x2 1 + y + y2= 8x3 1 - y 1 + y + y2viii x4 - x= x x3 - 1= x x3 - 13= x x - 1 x2 + x × 1 + 12 as a3-b3=a - b a2 + ab + b2= x x - 1 x2 + x + 1 -1 View Full Answer