Question

12. Simplify using identity
(9p - 5q)²​

Answer 1

$question = (9p - 5q)^{2} \\ solution. \\ formula = (a - b) {}^{2} = {a}^{2} - 2ab + {b}^{2} . \\ (9p - 5q)^{2} \\ = (9p)^{2} - 2(9p)(5q) + (5q)^{2} \\ = 81 {p}^{2} - 90pq + 25 {q}^{2} \: \: answer...$

Answer 2

Answer:

9p−5q)

2

+180pq=(9p+5q)

2

LHS=(9p)

2

−2(9p)(5q)+(5q)

2

+180pq

=81p

2

−90pq+25q

2

+180pq

=81p

2

+90pq+25q

2

RHS=(9p+5q)

2

=(9p)

2

+2(9p)(5q)+(5q)

2

=81p

2

+90pq+25q

2

LHS=RHS