If, in a quadratic equation, the values of a and c have opposite signs, the solutions of the equation are real numbers.

Ax²+bx+c=0, a>0, c<0 (or a0)

D=b²-4ac ≥ 0 always will be positive

because negative*positive = negative,

a*c - negative, so (-4ac) positive

So,

If, in a quadratic equation, the values of a and c have opposite signs, the solutions of the equation are real numbers.

True