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What is the equation of the following graph in vertex form? parabolic function going down from the left through the point zero comma twelve and through the point two comma zero and turning at the point four comma negative four and going up through the point six comma zero and continuing towards infinity courtesy of texas instruments a: y = (x − 4)2 − 4 b: y = (x + 4)2 − 4 c: y = (x + 2)2 + 6 d: y = (x + 2)2 + 12

Can someone pls ! pls answer all. no explanation needed..

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25