exam Maths Puzzle Numerical Ability

The area of a rectangle is 24 square meters.Find the length and width of the rectangle if its length is 2 meters greater than its width. Use an equation and the formula---->area of the rectangle=(width)(length).

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exam Other Question

Suppose A=QR, where Q and R are n*n, R is invertible and upper triangular, and Q has the property that (Q^T)Q = I. Show that for each b in R^n, the equation Ax=b has a unique solut I need help with this: find the polynomial written as a product of linear factors: f(x)=2x^3+5x^2-11x+4