Question

Which equation involves a prime quadratic and cannot be solved by factoring? A. x2 + 5x − 4 = 0 B. x2 − x − 6 = 0 C. x2 + 3x − 4 = 0 D. x2 + 6x + 9 = 0 Reset

Answer 1

x2 + 5x − 4 = 0

Explanation:

Answer 2

Option A

Explanation:

We can try to factorize all the options one by one.

For A:

`x^(2) +5x-4\\=> x^(2)+4x+x-4\\=>x(x+4)+1(x-4)`

We can see that the quadratic expression cannot be solved by factorization as the factors at the end of factorization are not equal in both brackets. So Option A is the correct answer for the given question.

Moreover we can also note that all the other quadratic expressions can be factorized ..