Question

4. Simplify the following expression and
find its value, when x = -1 and y = 2.
2x2 - 3y + 3x2 + 5y2 + 5x - 7 - 7x + 2y.​

Answer 1

Step-by-step explanation:

2x

2

−3y+3x

2

+5x

2

+5x−7−7x+2y

=10x

2

−2x−y−7

At x=−1 and y=2,

10(−1)

2

−2(−1)−2−7

= 10+2−2−7

=3