Home
Calculator
Basic Math
Arithmetic
Fractions & Decimals
Ratios & Proportions
Percentages
Basic Number Theory
Pre-Algebra
Integers & Absolute Values
Factors & Multiples
Prime Factorization
Basic Equations & Inequalities
Coordinate Plane & Graphing
Algebra
Linear Equations & Inequalities
Quadratic Equations
Polynomials & Factoring
Functions & Graphs
Systems of Equations
Trigonometry
Trigonometric Functions
Trigonometric Identities & Equations
Right Triangle Trigonometry
Unit Circle
Graphing Trigonometric Functions
Calculus
Limits & Continuity
Derivatives & Applications
Integrals & Applications
Series & Sequences
Multivariable Calculus
Precalculus
Functions & Graphs
Polynomial & Rational Functions
Exponential & Logarithmic Functions
Conic Sections
Sequences & Series
Statistics
Descriptive Statistics
Probability
Hypothesis Testing
Regression Analysis
Inferential Statistics
Chemistry
Atomic Structure
Periodic Table
Chemical Bonding
States of Matter
Chemical Reactions
Finite Math
Matrices & Determinants
Linear Programming
Set Theory
Probability & Financial Mathematics
get started now
Basic Math
Arithmetic
Fractions & Decimals
Ratios & Proportions
Percentages
Basic Number Theory
Pre-Algebra
Integers & Absolute Values
Factors & Multiples
Prime Factorization
Basic Equations & Inequalities
Coordinate Plane & Graphing
Algebra
Linear Equations & Inequalities
Quadratic Equations
Polynomials & Factoring
Functions & Graphs
Systems of Equations
Trigonometry
Trigonometric Functions
Trigonometric Identities & Equations
Right Triangle Trigonometry
Unit Circle
Graphing Trigonometric Functions
Calculus
Limits & Continuity
Derivatives & Applications
Integrals & Applications
Series & Sequences
Multivariable Calculus
Precalculus
Functions & Graphs
Polynomial & Rational Functions
Exponential & Logarithmic Functions
Conic Sections
Sequences & Series
Statistics
Descriptive Statistics
Probability
Normal Distribution
Hypothesis Testing
Regression Analysis
Finite Math
Matrices
Linear Programming
Sets & Counting
Probability
Statistics
Linear Algebra
Matrices
Vector Spaces
Determinants
Eigenvalues & Eigenvectors
Linear Transformations
Chemistry
Atomic Structure
Chemical Bonds
Stoichiometry
Acids & Bases
Thermochemistry
Solve
Basic Math
Pre-Algebra
Algebra
Trigonometry
Precalculus
Calculus
Statistics
Finite Math
Linear Algebra
Chemistry
Example
3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b
Question
$$(-42)-(-39)$$
Evaluate
$-3$
Solution Steps
The opposite of $-39$ is $39$.
$$-42+39$$
Add $-42$ and $39$ to get $-3$.
$$-3$$
Show Solution
Hide Solution
Factor
$-3$
Find Result For
