www.bbcnoun.com.ng 8/10 A ________ variable is of the form x+iy, where x and y are real numbers. complex The simplification of i55 is _________ -i If the discriminant of a quadratic equation is greater than zero. The equation will have two _____ solutions. distinct real Suppose z5=2+3i and z6=6+9i are complex numbers and3z5+7z6=m+in. The values of m is 48 The equation:x2-4x+5=0 has _____ roots. Real Suppose α and β are the roots of an equation:ax2+bx+c=0. Then, -ba is the _______ of roots. Sum An equation of the form:ax2+bx+c=0, where a, b and c are constants is referred to as ____ equation. quadratic Which is the correct solution of x2+7x+12=0? -4 and-3 The sum of the first n ______ numbers is given by 1+2+3+…+n=n(n+1)2 Natural If z3=3+2i and z4=4+3i. Then, z3∙ z4 is 6+17i