Which of the following quadratic equations can be solved by grouping?(1 point)
Responses
x2+10x+21=0
x squared plus 10 x plus 21 equals 0
x2−4x−8=0
x squared minus 4 x minus 8 equals 0
x2−12x+18=0
x squared minus 12 x plus 18 equals 0
x2+8x−22=0