Question

write down the squares of 5c + 2d

Answer 1

Solution: square of 5c + 2d will be written as (5c + 2d)^2. One solving,

we obtain, (5c +2d) x (5c + 2d) = 5c x 5c + 5c x 2d + 2d x 5c + 2d x 2d = 25c^2 + 10cd + 10cd + 4d^2 = 25c^2 + 4d^2 + 20cd.

Answer 2

$soln : \\ \\ = (5c) {}^{2} + 2.5c.2d + (2d) {}^{2} \\ \\ = 25c {}^{2} + 20cd + 4d {}^{2}$