Question

Using suitable simplify (7x+5y)²+(7x-5y)²​

Answer 1

Answer:

(7x+5y)²+(7x-5y)²

using (a+b)² = a²+b²+2ab and (a-b)²= a²+b²-2ab

49x²+25y²+70xy+49x²+25y²-70xy

98x²+50y²

Answer 2

Answer:

(7x+5y)²+(7x-5y)²

since, (a+b)²=a²+b²+2ab

[(7x)²+(5y)²+2×7x×5y]+(7x-5y)²

[49x²+25y²+70xy]+(7x-5y)²

since, (a-b)²=a²+b²-2ab

[49x²+25y²+70xy]+[(7x)²+(5y)²-2×7x×5y]

[49x²+25y²+70xy]+[49x²+25y²-70xy]

49x²+25y²+70xy+49x²+25y²-70xy

98x²+50y²