Question 1 Diego is solving the equation x2 – 12x = 21
Which value must be added to both sides of the equation to make the left side a perfect -square trinomial?

Can someone me do math because i am having a breakdown rn because i don’t get it

Drag each expression to the correct location on the solution. not all expressions will be used. consider the polynomial 8x + 2x2 - 20x - 5. factor by grouping to write the polynomial in factored form.

The collection of beautiful oil paintings currently on display at an art gallery well defined; set not well defined; not a set