Ax²+bx+c=0 , a>0, c<0 (or a<0, c>0) D=b²-4ac ≥ 0 always will be positive because negative*positive = negative, a*c -negative, so (-4ac) positive So, <span>If, in a quadratic equation, the values of a and c have opposite signs, the solutions of the equation are real numbers. </span>True
