Question

Evaluate 2x2 − 5y when x = -3 and y = 4.

Answer 1

Is that 2x^2? (the x is squared)?

Answer 2

-2

Answer 3

yes

Answer 4

-2 the answer

Answer 5

Assuming it is \[2x ^{2}-5y\]

You evaluate as
\[(2 \times-3 ^{2}) - (5\times4)\]

Which is the same as \[(2 \times-3\times-3) - (5\times4)\]

Which is the same as \[(2 \times9) - (5\times4)\]

Answer 6

Yup, you got it MzR, good job.

Answer 7

Which, as has been posted previously, is 18-20=-2

Answer 8

thanks both of u...:)

Answer 9

u there