Can someone please help me?

9514 1404 393

  x = 26

Step-by-step explanation:

The sum of the measures of the angles in a triangle is 180°.

  (2x)° +50° +(3x)° = 180°

  5x +50 = 180 . . . . . . . divide by °, collect terms

  x +10 = 36 . . . . . . . . . divide by 5

  x = 26 . . . . . . . . . . . . . subtract 10

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct