Express 93x+2×27x−19^{3x+2}\times 27^{x-1}93x+2×27x−1 in the form 3y3^y3y, giving y y\,y in the form ax+bax+bax+b, where a a\,a and b b\,b are constants.
233 exam-style questions on Edexcel A Level Maths Algebraic Expressions, covering 1.1 Index Laws, 1.2 Expanding Brackets, 1.3 Factorising, 1.4 Negative and Fractional Indices, and 1.5 Surds. Each one has a worked solution and a mark scheme showing where the marks go.