book Maths Puzzle Numerical Ability

Solve the equation

SQRT of (x^2)+20=6

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book Other Question

I need help in answering this problem:
a^2 + 7a + 6
I only need to factor it. Hi, The question is a Farmer has Pigs & Chickens on his farm of which the sum of all the pigs & chickens legs equals 101. How many Pigs and how many chickens are on his farm.