Question

Evaluate the following.
a) 8x² + 5xy - y3 for x = 3 and y = 2
b) 9x2 + 3x = 2 + 4 for x = 5​

Answer 1

Answer:

$8x {}^{2} + 5xy - 3y(x = 3)(y = 2)$

$72 + 30 - 6 = 96$

$9x {}^{2} + 3x = 2 + 4(x = 5)$

$225 + 15 = 6$

Answer 2

Answer:

$a) \: \: \: 8 {x}^{2} + 5xy - {y}^{3} \\ put \: x = 3 \\ y = 2 \\ \\ 8 ( {3}^{2} )+ 5(3)(2) - {2}^{3} \\ 72 + 30 - 8 = 94$

$b) \: \: \: 9 {x}^{2} + 3x = 2 + 4 \\ put \: x = 5 \\ 9( {5}^{2} ) + 3(5) = 6 \\ 225 + 15 - 6 = 234$

hope it help you dear ✌️✌️✌️