Welcome :: Homework Help and Answers :: Mathskey.com

Recent Visits

Q&A
Unanswered
Categories
Users
Ask a Question

Welcome to Mathskey.com Question & Answers Community. Ask any math/science homework question and receive answers from other members of the community.

Q&A Categories
BASIC MATH (93)
PRE-ALGEBRA (441)
ALGEBRA 1 (2,216)
GEOMETRY (864)
ALGEBRA 2 (2,745)
TRIGONOMETRY (1,186)
PRECALCULUS (1,903)
CALCULUS (2,791)
STATISTICS (129)
PHYSICS (658)
CHEMISTRY (136)
MECHANICAL ENGINEERING (64)
ELECTRICAL ENGINEERING (207)
Winplot Tutorials (2)

Most popular tags

solving-equations system-of-equations functions math slope-intercept-form physics homework-help trigonometric-identities integration substitution-method limits calculus

13,435 questions

17,804 answers

1,438 comments

776,657 users

Find a • b. a = 5i + 7j, b = -4i + 3j

0 votes

calculus

asked Aug 8, 2014 in CALCULUS by Tdog79 Pupil
reshown Aug 8, 2014 by bradely

Share this question

Google+ Facebook Twitter LinkedIn Reddit

Please log in or register to add a comment.

Please log in or register to answer this question.

1 Answer

0 votes

a =<5,7> b =<-4,3>

a ⋅ b is a scaler product

if a =<x1,y1> b= <x2,y2>

a ⋅ b =x1x2+y1y2

a ⋅ b =(5)(-4)+(7)(3)

=-20+21

=1

answered Aug 8, 2014 by anonymous

Please log in or register to add a comment.

Related questions

Find the dot product, a • b. a = 6i + 5j, b = -5i + 4j

asked Aug 4, 2014 in CALCULUS by Tdog79 Pupil

calculus

Find the magnitude and direction angle θ, to the nearest tenth of a degree, for the given vector v. v = -4i - 3j

asked Jul 17, 2016 in PRECALCULUS by anonymous

pre-calc

find n if position vectors 3i-2j-k,2k+3j-4k,-i+j+2k,4i+5j+nk line on the same plane

asked Nov 20, 2013 in PRECALCULUS by futai Scholar

vectors
plane

If the graph of y=x^3+ax^2+bx-4 has a point of inflection at (1,6), what is the value of b

asked Dec 6, 2019 in CALCULUS by reyesl2 Rookie

calculus
point
of
point-of-inflection

Use the Law of Sines to solve the triangles. A = 56°, a = 12, b = 14

asked Aug 8, 2014 in CALCULUS by Tdog79 Pupil

calculus

Solve the triangle. A = 51°, b = 11, c = 7

asked Aug 4, 2014 in CALCULUS by Tdog79 Pupil

calculus

simplify theses complex numbers to its smallest form (7+3i)(-7+5i)(-8-4i)

asked Dec 7, 2013 in ALGEBRA 1 by futai Scholar

complex-numbers

If u = i + 3j - 2k, and v = 4i - 2j - 4k.

asked Jun 8, 2013 in PRECALCULUS by anonymous Apprentice

vectors-multiplication

Find a ⋅ b. a = 4i - 4j, b = 4i + 5j

asked Aug 25, 2014 in PRECALCULUS by anonymous

trig
pre-calc

if vector A+B=2i+6j-2k and A-B=4i+2j-11k. Find magnitude of vector A and B?

asked Nov 20, 2013 in PRECALCULUS by linda Scholar

vectors

.suppose a and b are integers and a^2-5b is even. Prove that b^2-5a is even.

asked Oct 26, 2014 in PRECALCULUS by anonymous

calculus

(b.) At what rate is the water level rising?

asked Oct 14, 2020 in CALCULUS by Jinxies Rookie

rate-of-change
calculus
depth
#help-me

for the following function, find (f^-1)'(a). f(x)=x^2+3x+2, a=2

asked Jun 5, 2020 in CALCULUS by anonymous

calculus

for the following function, find (f^-1)'(a). f(x)=x+sinx, a=0

asked Jun 4, 2020 in CALCULUS by anonymous

calculus

for each of the following functions find f(a),f(a+h),f(a+h)-f(a)/h,lim h>0

asked May 1, 2017 in CALCULUS by anonymous

calculus

Find the equation for the hyperbola with center at the origin, one vertex at (6, 0), and a focus at (10, 0).

asked Sep 9, 2014 in CALCULUS by tonymate Pupil

calculus
equation-of-a-hyperbola
foci-of-a-hyperbola
vertex-of-a-hyperbola
hyperbola

Find the standard form of the equation of the parabola with a focus at (0, 2) and a directrix at y = -2.

asked Aug 16, 2014 in CALCULUS by anonymous

calculus

Find the standard form of the equation of the parabola with a focus at (0, 4) and a directrix at y = -4.

asked Aug 8, 2014 in CALCULUS by Tdog79 Pupil

calculus

Find the standard form of the equation of the parabola with a focus at (0, -10) and a directrix at y = 10.

asked Aug 7, 2014 in CALCULUS by Tdog79 Pupil

calculus

Find the standard form of the equation of the parabola with a focus at (-7, 0) and a directrix at x = 7.

asked Aug 7, 2014 in CALCULUS by Tdog79 Pupil

calculus

Copyright © 2024 MATHSKEY. All Rights Reserved. Sitemap|Terms Of Use|Disclaimer|Contact Us|FAQ

...