An ipad is worth R1200, excluding 15% VAT. What is the selling price of the ipad including VAT

In the figure below, segment ac is congruent to segment ab: triangle abc with a segment joining vertex a to point d on side bc. side ab is congruent to side ac which statement is used to prove that angle abd is congruent to angle acd? segment ad bisects angle cab. triangle acd is similar to triangle abd. segment ad is congruent to segment ac. angle cab is congruent to angle cba.

Is this a polynomial function? i need to know asap

State one method by which you can recognize a perfect square trinomial.