4a^{2}+9b^{2} -x^{2} -1+12ab-2xy

can someone explain this pls it's hurting my brain:,)

Np4=12np2 with clear explanation.

Use the multiplier method to incrases £258 by 43%

You are remodeling your kitchen. you’ve contacted two tiling companies who gladly told you how long it took their workers to tile of a similar size jim completed half the floor in 8 hours. pete completed half of the other floor in 7 hours. if pete can lay 20 more tiles per hour than jim, at what rate can jim lay tiles