Find the number to add to x^2-18x
to make it a perfect square trinomial. Write that trinomial as the square of a binomial.

Find the number to add to x218x to make it a perfect square trinomial Write that trinomial as the square of a binomial class=

Respuesta :

frika

Answer:

A. add 81; [tex](x-9)^2[/tex]

Step-by-step explanation:

The perfect square formula

[tex](a-b)^2=a^2-2ab+b^2[/tex]

Rewrite expression [tex]x^2-18x[/tex] as follows:

[tex]x^2-2\cdot 9\cdot x[/tex]

So, to form a perfect square, [tex]+9^2[/tex] is missed.

When we add [tex]9^2=81,[/tex] we will get

[tex]x^2-2\cdot 9\cdot x+9^2=(x-9)^2[/tex]

ACCESS MORE
EDU ACCESS
Universidad de Mexico