Question

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

Answer 1

need to pick one wich one

Answer 2

a b or d

Answer 3

x2+10x+21=0
(x+7)(x+3) = 0
x = -7 or x = -3

Answer 4

None of the quadratic equations above can be solved by grouping.

Answer 5

If you need to pick one quadratic equation that can be solved by grouping, it would be:

x^2 - 4x - 8 = 0

Answer 6

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

Answer 7

You are correct. The quadratic equation x^2 + 10x + 21 = 0 can be solved by grouping. By factoring, we have (x + 7)(x + 3) = 0, which means x = -7 or x = -3. Well done!