Friday

March 27, 2015

March 27, 2015

Posted by **John** on Tuesday, April 20, 2010 at 2:24am.

2x^2 - 3xy + 4y^2 for x=2, y=-1

My Answer:

(2(2^2)) - (3*2*-1) + (4(-1^2)) = 10

Text Book Answer: 18

Please help. Am I doing something wrong? I redid the expression 3 times and still got 10. But why textbook say it's 18?

Thank you.

- Gr. 10 Math -
**Dr Russ**, Tuesday, April 20, 2010 at 5:00am2x^2 - 3xy + 4y^2 for x=2, y=-1

My Answer:

(2(2^2)) - (3*2*-1) + (4(-1^2)) = 10

8-(-6)+4(1)=14+4=18

The text book is correct.

**Answer this Question**

**Related Questions**

Math PIZZAZZZ - how does a rodeo star get around?? well if you cant give me an ...

Math! - 1) What is the value of 19 + 5a^4 + 3b^2 when a = 2 and b = -4? (this ...

Math - Evaluate the expression for the given value. x = -2; y = 3; z = -1 -2x^2y...

math (algebra) - explain how to evaluate an expression with a variable when you ...

Advanced Math I - If a * b = a - 3b and a # b = 2a + 3b, evaluate the expression...

Math - Evaluate each expression for the given value of the variable 2*2 for x=3

math - evaluate the expression for the given value of the variable p + 13 when p...

Math - Evaluate each expression for the given value of the variable 3-y2+fory=5

math - Evaluate each expression for the given value of the variable. 2x2 for x =...

math-college algebra - y-3=1/2(x-6) "finding the value of a variable" x=2 I know...