Question

Express as a perfect square with the help of a formula and then find the value of÷
(a). 9(a+b)²-6(a+b)c+c²,then a =5,b=(-7) and c=11​

Answer 1

ANSWER:

289

Step-by-step explanation:

9{5+(-7)}^2 -6{5+(-7)}11 + 11^2         [substituting values]

9(-2)^2 -6(-2)11 + 121                       [solving brackets]

9*4 -6*-22 +121     [ *=multiply]     [x^2/-x^2=x^2(square of both x and -x results                                    in x^2) take an example x=2 . If we multiply 2*2=4 , -2*-2=4]

36 +132 +121               [- * - = +]   (rules of  BODMAS) [B=bracket , O=of , D=divide , M=multiply ,  A=addition , S= subtraction ]

=289