Question

16x^2+40xy+25y^2

Answer 1

16x^2 − 40xy +25y^2
given the perfect square pattern a^2 − 2ab + b^2 = (a − b)^2
=> (4x)^2 − 2(4x)(5y) + (5y)^2
=> (4a − 5y)^2

or if you dont see the pattern

16 * 25 = 400
-20 * -20 = 400
-20 + -20 = -40

=> 16x^2 − 20xy − 20xy + 25y^2
=> 4x(4x − 5y) − 5y(4x − 5y)
=> (4x − 5y)(4x − 5y)
=> (4x − 5y)^2

Answer 2

hmm? why so many questionmarks lol.

Answer 3

o_O ok...