book Maths Puzzle Numerical Ability

the difference of the squares of two consecutiveodd integersis 48.find the integers

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book Other Question

a) What is the sum of the roots of the equation ax2(squared)+ bx + c = 0?
b) What is the product of its roots? Are the following lines parallel, perpendicular, or neither?

L1 through (-4,-7)and (1,3)
L2 through (2,6) and (4,10)

3/1- -7/-4= 10/5
10/4 - 6/2= 4/2

Is this problem parallel?

Thank you!