Nilai x yang memenuhi agar -x2 + 4x + 5 ≤ 0 adalah … A. x ≥ -5
B. x ≥ -1
C. x ≥ 5
D. x ≥ 0
E. x ≥ 2​

i pretty sure it is

a) 7x=7

step-by-step explanation:

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8