Plz help
1) If
![x^2 - 7x + c = (x + a)^2](https://img.qammunity.org/2022/formulas/mathematics/middle-school/x1bs144h3jo04e4hlbjbzz5gielpbcba.png)
for some constants a and c, then find a.
2) Find all real solutions to
![x^2 + 4x + 4 = 100x^2 + 20x + 1](https://img.qammunity.org/2022/formulas/mathematics/middle-school/6fdav47tudqb2v2uy2to3xfhkhinssop.png)
If you find more than one, then list the values separated by commas.
3) Find all real solutions to
![x^4 + 10x^2 + 9 = 0](https://img.qammunity.org/2022/formulas/mathematics/middle-school/q5h5qghfbqwr5jjo88hs400ae8cyv9no.png)
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.