Which of the following quadratic equations can be solved by grouping?(1 point)
Responses
x2−12x+18=0
x squared minus 12 x plus 18 equals 0
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+8x−22=0
None of the quadratic equations above can be solved by grouping.
need to pick one wich one
If you need to pick one quadratic equation that can be solved by grouping, it would be:
x^2 - 4x - 8 = 0
a b or d
If you need to choose between options a, b, or d, the quadratic equation that can be solved by grouping is:
b) x^2 + 10x + 21 = 0
x2+10x+21=0
(x+7)(x+3) = 0
x = -7 or x = -3