Consider the equation
x^2-10x-11=0

x = - 1, x = 11

Step-by-step explanation:

Given

x² - 10x - 11 = 0

Consider the factors of the constant term (- 11) which sum to give the coefficient of the x- term (- 10)

The factors are - 11 and + 1, since

- 11 × 1 = - 11 and - 11 + 1 = - 10, thus

(x - 11)(x + 1) = 0

Equate each factor to zero and solve for x

x - 1 = 0 ⇒ x = 11

x + 1 = 0 ⇒ x = - 1

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer