By completing the square, find, in terms of the constant kkk, the roots of the equation x2+kx−6=0x^2 + kx - 6 = 0x2+kx−6=0
Hence find the exact roots of the equation x2+4x−6=0x^2 + 4x - 6 = 0x2+4x−6=0.
8 exam-style questions on WJEC A Level Maths 1.2.4 Algebra and Functions. Each one has a worked solution and a mark scheme showing where the marks go.