plz help
1) If [tex]x^2 - 7x + c = (x + a)^2[/tex] for some constants a and c, then find a.
2) Find all real solutions to [tex]x^2 + 4x + 4 = 100x^2 + 20x + 1[/tex] If you find more than one, then list the values separated by commas.
3) Find all real solutions to [tex]x^4 + 10x^2 + 9 = 0[/tex] If you find more than one, then list the values separated by commas.
plz answer even if you only have an answer to one of the questions.