The diagram shows a parallelogram ABCD and an equilateral triangle BDE. CDE is a straight line.

(a) Work out angle BDE
Give a reason for your answer.

(b) Work out angle CDB
Give a reason for your answer.

Talia grouped the terms and factored out the gcf of the groups of the polynomial 15x2 – 3x – 20x + 4. her work is shown below. (15x2 – 3x) + (–20x + 4) 3x(5x – 1) + 4(–5x + 1) talia noticed that she does not have a common factor. what should she do?