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12. Find the value of 49x2 - 70xy + 25y2, if x = 5 and y = 7
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Given:
x = 5 & y = 7
49x^2 - 70*x*y + 25y^2
= 49*5*5 - 70*5*7 + 25*7*7
= 7*7*5*5 - 2*5*7*5*7 + 5*5*7*7
= 7*7*5*5*(1 - 2 + 1)
= 7*7*5*5*(2 - 2)
= 7*7*5*5*(0)
= 0 ——> Answer
x = 5 & y = 7
49x^2 - 70*x*y + 25y^2
= 49*5*5 - 70*5*7 + 25*7*7
= 7*7*5*5 - 2*5*7*5*7 + 5*5*7*7
= 7*7*5*5*(1 - 2 + 1)
= 7*7*5*5*(2 - 2)
= 7*7*5*5*(0)
= 0 ——> Answer
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