Examples 1 to 3

Parin Sir > Quantitative Aptitude (Maths) > Algebraic Formulae > Examples 1 to 3
17
Jul
Examples 1 to 3

(1) If  a + b  =  9  and  a – b  =  5,  find   a2 +  b2   and  ab.

Soln. 2( a2+b2 ) =  (a + b) 2 +  (a – b) 2

=    (9) 2 +  (5) 2

=    1…

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