4. The difference of two squares. We know that ( a + b ) ( a - b ) = a2 - b2 then a2 - b2 = ( a + b ) ( a - b ) ...........® (1) Thus i) Find the square root of the 1st term and then square root of the 2nd term. ii) Now express your answer as the product of the sum and difference of the two square roots found in (1) as two factors.
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