Question

5²+x²+ (30)²= (31 )² then x is
a) 9 b) 8 c) 7 d) 6

Answer 1

Answer:

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Step-by-step explanation:

5² + x² + 30² = 31²

25 + x² + 900 = 961

925 + x² = 961

x² = 961 - 925

x² = 36

x = √36

x = 6

∴ Option (d)

Answer 2

Answer:

Answer:

x^2 = 31^2 - 30^2 -5^2

x^2 = (31+30)(31-30) - 25

by identity : a^2 - b^2 = (a+b)(a-b)

x^2 = 61 - 25

x^2=36

x=√36

x=√6×6

x=6

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