exam Maths Puzzle Numerical Ability

3x^2-10x+2 finding the vertex can someone help me please

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Charlie Consumer's credit card balance on April 1st was $40. On April 7th, he made a $10 payment and on April 25th he charged a $25 item. If his credit card company charges a fina Please show me how to factoring by grouping. Thanks!

r^2-9tw+3rw-3rt ?