Question

23 Show that the square of an odd integer is of the form 4 - 1. for some integer
24. If the Highest Common Factor of 210 and 55 is expressible in the form 55 325. fund​

Answer 1

23.the form 4m+1, for some integer m. Ifr=1⇒a=4q+1,(4q+1) is not divisible by 2. Ifr=2⇒a=4q+2,2,(2q+1) is divisible by 2⇒2(2q+1) is even.

26.highest common factor is 5

so

55x-325

55x=330

X=6

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