Question

Question 12Which equation contains a perfect square trinomial?O x2 - 6x + 72 = 0O x2 + 2x - 4 = 0O2? + 14x + 49 = 0O x2 – 5x + 64 = 0

Answer 1

A perfect square trinomial has a general structure which is

`a^2\pm2ab+b^2`

The one that meets this structure is

`x^2+14x+49`

We know it because it can be re written as

`x^2+2\cdot7\cdot x+7^2`

Which shows in a more explicit way the estructure of a perfect square trinomial. The right answer is c