Question

Find the value of expression 81x^2+16y^2-72xy, if x=2 and y=3/4

Answer 1

I think put values of x=2 and y=3/4 in equation then you will get answer
try it yourself
it will make your ability strong
hope it helps!

Answer 2

$\huge\boxed{\texttt{\fcolorbox{Red}{aqua}{Hello Friend}}}$

Here is your answer

If x = 2
y = 3/4

$81x {}^{2} + 16y {}^{2} - 72xy \\ = 81(2) {}^{2} + 16( \frac{3}{4} ) {}^{2} - 72 \times 2 \times \frac{3}{4} \\ = 81 \times 4 + 3 \times 3 - 36 \times 3 \\ = 324 + 9 - 108 \\ = 225$
Hope it helps you