Let x and y be real numbers such that x^2 + y^2 = 1. Find the max value of 2x - 5y.

A hint was given to use Cauchy-Schwarz but I'm not sure how to apply it to vectors?

  1. 👍
  2. 👎
  3. 👁

Respond to this Question

First Name

Your Response

Similar Questions

  1. alebra

    Let f(x)=2x^2+x-3 and g(x)=x-1. Perform the indicated operation then find the domain. (f*g)(x) a.2x^3-x^2-4x+3; domain:all real numbers b.2x^3+x^2-3x; domain: all real numbers c.2x^3+x^2+4x-3; domain: negative real numbers

  2. Algebra

    To which subset of real numbers does the following number belong? square root of 7 A)rational numbers B)irrational numbers****** C)whole numbers, integers, rational numbers D)whole numbers, natural numbers, integers

  3. Pre-Calculus

    A rectangle is bounded by the x-axis and the semicircle y = √36 – x2, as shown in the figure below. Write the area A of the rectangle as a function of x, and determine the domain of the area function. A = all real numbers

  4. algebra 1

    hat is the range of the function on the graph? all the real numbers all the real numbers greater than or equal to 0 all the real numbers greater than or equal to 2 all the real numbers greater than or equal to –3

  1. Math

    The twice–differentiable function f is defined for all real numbers and satisfies the following conditions: f(0)=3 f′(0)=5 f″(0)=7 a)The function g is given by g(x)=e^ax+f(x) for all real numbers, where a is a constant. Find

  2. Math

    Name the subset(s) of real numbers to which the number -2 belongs. Irrational Numbers. Rational Numbers. Integers. Whole Numbers. Natural Numbers.

  3. rational zeros theorem

    Use the rational zeros theorem to find all the real zeros of the polynomial function. Use the zeros to factor f over the real numbers. f(x)=25x^4+26x^3+126x^2+130x+5 Find the real zeros x= Use the real zeros to factor f f(x)=

  4. Math help Ms. Sue please

    1. Name the subset(s) of real numbers to which the number zero belongs. You can choose more than one answer. Irrational numbers Integers Whole numbers Natural numbers 2. Write an algebraic expression for the word phrase: the

  1. Math

    Which set of best describes the numbers used on a scale for a standard thermometer? A.whole numbers B.rational numbers C.real numbers D.integers I choose Real Numbers if I am incorrect can you explain why.

  2. Precalc

    To which set(s) of numbers does the number sqrt -16 belong? Select all that apply. real numbers complex numbers*** rational numbers imaginary numbers*** irrational numbers I can only pick two, and that's what I think it is. Please

  3. AiMS MATH

    -5 Is A Member Of Which Subset Of Real Numbers. a) natural numbers b) whole numbers c) intergers d) rational numbers e) irrational numbers

  4. algebra

    Choose all the sets containing the number –1.576. natural numbers whole numbers integers rational numbers irrational numbers real numbers

You can view more similar questions or ask a new question.