-(x-2)+7=19 I don’t get it can some one please help me

x = -10

Step-by-step explanation:

-(x-2)+7=19

Distribute the minus sign

-x+2 +7 = 19

Combine like terms

-x +9 = 19

Subtract 9 from each side

-x +9-9 = 19-9

-x = 10

Multiply by -1

x = -10

answer: what are the answer choices?

step-by-step explanation:

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