Question

1) if x=5 and y=7 then find the value of ( x+y)^2



2) find the value of (a+ b)^2 if ab=8 and a^2 + b^2=20




please explained with full explanation and image also
​

Answer 1

Answer:

Question :-

1) if x=5 and y=7 then find the value of ( x+y)^2

Required Answer :-

144

Formula used here :-

${(x + y)}^{2} = {x}^{2} + 2xy + {y}^{2}$

Solution :-

${(5 + 7)}^{2} = {5}^{2} + 2 \times 5 \times 7 + {7}^{2}$

$= 25 + 70 + 49$

$= 144$