Question

Write the trinomial as a square of a binomial or as an expression opposite to a square of a binomial: 4cd -25c^2 -0.16d^2

Answer 1

= -(5c - 0.4d)^2

Explanation:

4cd - 25c^2 - 0.16d^2

= 4cd - (5c)^2 - (0.4d)^2

= -[(5c)^2 -2*5*0.4cd + (0.4d)^2]

= -[(5c)62 - 2*(5c)*(0.4d) + 0.4d)^2]

= -(5c - 0.4d)^2