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7. Using the identity (a-b )2 = ? A2 - 2ab + b2 , find the value of (9.8)2.& Write down the product of (r+r+ 1), (r= -x + 1) and (r+ -P + 1).9. Using the identity (a + b)2 = ( + 2ab + b-, find the value of (107).10. Using the identity (a + b)(a - b) = a - 6-, evaluate 124 x 116.11. Simplif: (5r+ 2v)--- (2x + 51)-.12. Using suitable identity, find the value of (509).73. Ifx = 13, find the value of r + -4. Find algebraically, the value of 1005 X 995.Simplify: +(3r + 4v)- +12(3x + 4y) (2x + 5v) + 9(2x + 5v). |
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Answer» (A-b)² = a²-2ab+b² (9.8)=(100-0.2)² |
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