a²-b² sum for practice
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(a+b) × (a-b) = a²-b²
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Step-by-step explanation:
1) Write the factors of 25^2-1 [Ans. (5x – 1)(5x + 1)]
2) Use a suitable identity to get each of the following products:
(i) (1.1m – 0.4) (1.1m + 0.4) [Ans. 1.21m^2 – 0.16]
(ii) (6x – 7) (6x + 7) [Ans. 36x^2 - 49]
2) Using identities, evaluate.
(i) 297 x 303 [Ans. 89991]
(ii) 78 x 82 [Ans. 6396]
(iii) 10.5 x 9.5 [Ans. 99.75]
(iv) 95 x 105 [Ans. 9975]
(v) 124 x 116 [Ans. 14384]
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