Prove the identity.cos 4u = cos2 2u - sin2 2u
What will be an ideal response?
cos 4u = cos (2u + 2u) = cos 2 2u - sin 2 2u.
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Factor completely.u2 - 4uv - 21v2
A. (u - 3v)(u + 7v) B. (u - 3v)(u + v) C. (u - v)(u + 7v) D. (u + 3v)(u - 7v)
Solve the problem.If one must always move downward or sideways along the lines of the graph shown, how many different paths are there from point A to point C?
A. 14 B. 10 C. 8 D. 12
Find the missing quantities. Round rates to the nearest tenth of a percent and dollar amounts to the nearest cent.
A. Markup: $32.00 Selling Price: $136.30 B. Markup: $136.30 Selling Price: $240.60 C. Markup: $325.94 Selling Price: $430.24 D. Markup: $33.38 Selling Price: $137.68
Find the product.(x + 2y)3
A. x3 + 6x2y + 12xy2 + 8y3 B. x3 + 8y3 C. x3 + 2x2y + 4xy + 4xy2 + 8y2 + 8y3 D. 3(x + 2y)