Question 1(x)
Use a suitable identity to get each of the following products:
$(7 a - 9 b) (7 a - 9 b)$

Open in App

Solution

$(7 a - 9 b) (7 a - 9 b) = (7 a - 9 b)^{2}$
$= (7 a)^{2} - 2 \times 7 a \times 9 b + (9 b)^{2} [U s i n g i d e n t i t y (a - b)^{2} = a^{2} - 2 a b + b^{2}]$
$= 49 a^{2} - 126 a b + 81 b^{2}$

Suggest Corrections

Similar questions

(7 a - 9 b) (7 a - 9 b)

Use suitable identity to solve $(7 a - 9 b) (7 a - 9 b)$

(2 y + 5) (2 y + 5)

(6 x - 7) (6 x + 7)

Join BYJU'S Learning Program

Explore more

Join BYJU'S Learning Program