Equation:
2x(squared) + 3x - 4 = 0
An engineer chooses to solve the equation above by using the quadratic formula rather than by factoring. Which of the following facts best explains this choice?
A. The expression 3squared - 4 (2)(4) is negative.
B. Only 3 is odd while 2 and -4 are even.
C. The expression 3squared -4 (2)(-4) is not a perfect square.
D. Only one of the factor pairs of -4 adds to 3.
The answer is C but I am not sure why. If you can explain it to me, it would be great.
Thanks
2x(squared) + 3x - 4 = 0
An engineer chooses to solve the equation above by using the quadratic formula rather than by factoring. Which of the following facts best explains this choice?
A. The expression 3squared - 4 (2)(4) is negative.
B. Only 3 is odd while 2 and -4 are even.
C. The expression 3squared -4 (2)(-4) is not a perfect square.
D. Only one of the factor pairs of -4 adds to 3.
The answer is C but I am not sure why. If you can explain it to me, it would be great.
Thanks