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Solution : 2y? - 4y - 30= 2(y? - 2y - 15)..taking out the common= 2(y2 - 5y + 3y - 15) ........= 2 (y(y - 5) + 3y - 5)]= 2(x - 5)(y + 3)Practice Set 6.11. Factorise.(1) x + 9x + 18(4) Sy? + 5y - 10(7) m-23m + 120(10) 2x + x - 45(2) x? - 10x + 9(5) p² - 2p - 35(8) m - 25m + 100(11) 20x2 - 26x + 8Let's learn.Factors of a + bWe know that, (a + b)' = a + 3b + 3ab + b |
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Answer» x²+6x+3x+18x(x+6)+3(x+6)(x+3) (x+6)x=-3x=-6 x^2 + 9x + 18 = 0; x^2 + 6x + 3x + 18 = 0; x( x + 6) +3 ( x + 6)=0; ( x + 3) ( x + 6); x = -3 & -6; 2) x^2 - 10x +9 =0,; x^2-9x -x + 9= 0; x( x - 9)-1( x - 9); ( x-9)( x -1)=0; x = 1 & 9; 3) 5y^2 + 5y -10=0; =5 y^2+10y - 5y - 10 =0; 5y( y +5) -5( y + 5)=0; (5y -5)(y +5); y =5/5; y = -5 |
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