exam Maths Puzzle Numerical Ability

i need help on this sum please factorize 5x^2-7y^2

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c/2-d/5=-4 and c-d/5=-8 solve by substitution method The following table lists the years in which the world's population first reached 3, 4, 5, and 6 billion.
1960 - 3 billion
1974 - 4 billion
1987 - 5 billion
1999 - 6 billion
a