Please help me with this ​

What are the soultion(s) to the quadratic equation 40- x^2=0

21 type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. the solution set of n2 - 14n = -45 is { (separate the solutions with a comma)

What is r i 4.5+10r=-6.5 with work pls