ladylee7527 ladylee7527
  • 19-05-2018
  • Mathematics
contestada

What is the value of the expression 2x2 + 3xy – 4y2 when x = 2 and y = - 4?

Respuesta :

altavistard
altavistard altavistard
  • 21-05-2018
Please use " ^ " to denote exponentiation:  2x^2 + 3xy – 4y^2

Now let x=2 and y= -4:

2(2)^2 + 3(2)(-4) - 4(-4)^2 = 8 - 24 -4(16) = -16 - 4(16) = -5(16) = -80 (answer)
Answer Link

Otras preguntas

Which out of the four is the correct answer to the question
A high school purchases a printing machine that can put lettering on clothing for $6,000. The school plans to print T-shirts with the school logo and sell them.
Round 45.755 to the nearest tenth
A health insurance company advertises on television, on radio, and in the local newspaper. the marketing department has an advertising budget of $42,000 per mon
Abraham lincoln said, "i hope to have god on my side, but i must have kentucky." what did he mean by this?
Which is greater?? I NEED HELP FOR HOMEWORK 0.036 or 0.035 they might be equal.
solve using substitution or elimination, make sure u answer the question.
Please need help thank you
A woman is 5 ft tall and her shadow is 4 ft long.A nearby tree has a shadow 30 ft long.How tall is the tree?
The average years of life remaining on an individual’s date of birth is called